Science and Technology

Science and Technology is an important component of General Studies Paper III in the UPSC Civil Services Mains Examination. The subject focuses mainly on recent technological developments, their applications, India's achievements, indigenous technological development and associated issues.

Major Areas Covered

• Recent developments in Science and Technology
• Applications of emerging technologies
• Impact of technology on everyday life
• Achievements of Indians in Science and Technology
• Indigenisation of technology
• Information Technology
• Space Technology
• Computers and Supercomputers
• Quantum Computing
• Robotics
• Nanotechnology
• Biotechnology
• Intellectual Property Rights
• Defence and missile technology
• Nuclear technology
• Emerging digital technologies

2. UPSC Mains Perspective

Science and Technology questions are generally application-oriented. Therefore, preparation should focus not merely on definitions but also on applications, benefits, challenges, India's initiatives and the way forward.

Preparation Area	What to Focus On
Concept	Understand the basic meaning and working of a technology.
Application	Study how the technology is used in real life.
India	Focus on Indian achievements, missions and indigenous development.
Challenges	Examine ethical, economic, environmental, security and regulatory concerns.
Way Forward	Suggest research, regulation, investment, capacity building and responsible use.

3. Space Technology

3.1 Major Indian Satellite Systems

India uses different satellite systems for communication, weather observation, remote sensing, navigation and astronomical research.

Satellite System	Full Form / Name	Major Purpose
INSAT	Indian National Satellite System	Communication and meteorological services
IRS	Indian Remote Sensing Satellite System	Earth observation and resource monitoring
IRNSS / NavIC	Indian Regional Navigation Satellite System	Navigation and positioning services
ASTROSAT	Astronomical satellite	Study of astronomical objects and phenomena
XPoSat	X-ray Polarimeter Satellite	Astronomical research

4. INSAT System

4.1 Meaning

INSAT stands for Indian National Satellite System. It combines communication and meteorological satellite capabilities and has played an important role in India's communication and weather-related services.

4.2 Important Features

• The first successful satellite associated with the INSAT system was INSAT-1B.
• INSAT-1B was launched in 1983.
• The system involves multiple Indian departments and agencies.
• Its services are used for communication, meteorology and related applications.

4.3 Major Applications of INSAT

• Weather forecasting
• Agricultural planning
• Telecommunication
• Internet connectivity
• Television broadcasting
• Radio and entertainment services
• Disaster management
• Disaster forecasting and early warning
• Banking and digital communication

4.4 Importance for Agriculture

Weather information is particularly important for Indian agriculture because a significant part of agricultural activity depends on monsoon conditions. Satellite-based weather information therefore assists agricultural planning and risk reduction.

4.5 Role in Disaster Management

• Provides communication support during disasters.
• Supports early warning systems.
• Helps communicate disaster-related information.
• Assists authorities in preparedness and response.

5. Indian Remote Sensing Satellite System

5.1 Meaning

Remote sensing satellites observe the Earth's surface and provide data about land, water, forests, minerals, oceans, environment and other resources.

5.2 Important Satellite Examples

• IRS satellites
• Cartosat
• Oceansat
• Resourcesat
• HySIS
• EOS series

5.3 Beginning of the IRS System

• The IRS system began with IRS-1A.
• IRS-1A was launched in 1988.

5.4 Applications of Remote Sensing

Sector	Application
Agriculture	Crop mapping, crop-area assessment, crop forecasting and soil-moisture assessment.
Water Resources	Monitoring rivers, reservoirs and groundwater resources.
Environment	Monitoring environmental changes, forests, pollution and glaciers.
Disaster Management	Assessment and management of floods, earthquakes, cyclones and other disasters.
Urban Development	Planning roads, highways and other infrastructure.
Rural Development	Planning connectivity and development projects.
Defence	Border monitoring, surveillance and strategic assessment.

6. Navigation Technology - NavIC

6.1 What is NavIC?

NavIC is India's regional satellite navigation system. It was earlier associated with the Indian Regional Navigation Satellite System (IRNSS).

6.2 Regional Rather Than Global

Unlike GPS, which is a global navigation system, NavIC is designed primarily to provide navigation services over India and the surrounding region.

• The system uses a constellation of navigation satellites.
• The coverage extends around the Indian region.
• It is intended to provide reliable positioning and timing services.

6.3 Two Major Services

Service	Users	Nature
Standard Positioning Service	General users	Open navigation service
Restricted Service	Authorised users	Restricted and encrypted service

6.4 Applications of NavIC

• Land navigation
• Air navigation
• Maritime navigation
• Rail transport
• Location-based services
• Personal navigation
• Resource monitoring
• Surveying
• Agricultural applications
• Scientific research
• Accurate timing
• Emergency and safety services
• Disaster management
• Cyclone alerts

7. GAGAN

7.1 Full Form

GAGAN stands for GPS Aided GEO Augmented Navigation.

It is India's Satellite Based Augmentation System (SBAS), developed jointly by the Indian Space Research Organisation and the Airports Authority of India.

7.2 Purpose

GAGAN improves the accuracy and reliability of satellite-based navigation, particularly for aviation.

7.3 Aviation Applications

• Improved aircraft navigation
• More accurate approach and landing
• Better route planning
• Improved aviation safety
• Reduction in dependence on purely ground-based navigation support

7.4 Advantages

• High positioning accuracy
• Improved navigation safety
• Better route optimisation
• Potential fuel savings
• Wide-area coverage
• Applications beyond aviation are possible

7.5 Other Potential Applications

• Railways
• Marine transport
• Agriculture
• Road transportation

8. GPS Spoofing

8.1 Meaning

GPS spoofing is a cyberattack in which false GPS signals are transmitted to deceive a receiver about its actual location.

8.2 How It Works

1. An attacker generates false navigation signals.
2. The false signals can overpower or confuse genuine signals.
3. The receiving system calculates an incorrect location.
4. The affected aircraft, ship, drone or other system may move in the wrong direction.

8.3 Possible Effects

• Aircraft navigation errors
• Ship navigation errors
• Drone navigation disruption
• Incorrect tracking information
• Military and strategic risks

8.4 Countermeasures

• Anti-spoofing technologies
• Multi-source location verification
• Signal analysis
• Continuous verification of navigation information

9. Satellite Launch Vehicles

A launch vehicle is a rocket used to carry a satellite or other payload from Earth into space. India has developed significant indigenous launch capability and can launch both Indian and foreign satellites.

9.1 Major Indian Launch Vehicles

Launch Vehicle	Full Form	Broad Role
PSLV	Polar Satellite Launch Vehicle	Primarily used for Earth observation and polar/varied missions.
GSLV	Geosynchronous Satellite Launch Vehicle	Designed for heavier satellites and higher orbits.
LVM3	Launch Vehicle Mark-3	Heavy-lift launch vehicle.
RLV	Reusable Launch Vehicle	Designed for repeated use and lower launch costs.
SSLV	Small Satellite Launch Vehicle	Rapid and economical launch of small satellites.

10. PSLV

10.1 Key Features

• PSLV is one of India's most successful launch vehicles.
• It was initially developed mainly for polar satellite missions.
• Its capabilities have been expanded through different variants.
• PSLV has also been used for important lunar and planetary missions.

10.2 Important Missions Associated with PSLV

• Chandrayaan-1
• Mars Orbiter Mission / Mangalyaan
• Other Earth observation and commercial satellite missions

10.3 Propulsion

PSLV uses a combination of solid and liquid propulsion stages.

11. GSLV and LVM3

11.1 GSLV

GSLV is designed to place heavier payloads into higher orbits and uses multiple propulsion technologies, including cryogenic propulsion.

11.2 Cryogenic Propulsion

• Uses cryogenic propellants.
• Liquid hydrogen acts as the fuel.
• Liquid oxygen acts as the oxidiser.
• Cryogenic technology provides high efficiency for upper-stage propulsion.

11.3 LVM3

LVM3 is a heavier launch vehicle and is capable of carrying substantially heavier payloads than PSLV.

12. Reusable Launch Vehicle - Pushpak

12.1 Concept

Conventional launch vehicles are generally expendable. A reusable launch vehicle is designed so that major components can return and be used again.

12.2 Advantages

• Reduction in launch costs
• Reduction in resource consumption
• Potential reduction in fuel expenditure
• More frequent launches
• Improved long-term space-launch economics

12.3 Pushpak

India's reusable launch vehicle programme is associated with the name Pushpak. The transcript discusses multiple experimental tests intended to demonstrate controlled return and landing capability.

13. SSLV

The Small Satellite Launch Vehicle is designed particularly for the growing small-satellite market.

Major Advantages

• Lower launch cost
• Quick preparation
• Simple launch requirements
• Suitable for small satellites
• Potential for rapid-response launches

The lecture highlights the ability of SSLV-related launch operations to respond rapidly to launch requirements.

14. Space Debris

The increasing number of objects placed in orbit creates the problem of space debris. Defunct satellites, spent rocket stages and other fragments can remain in orbit and create risks for operational spacecraft.

Possible Approaches

• Monitoring orbital debris
• Tracking potentially dangerous objects
• Using suitable spacecraft or stages for additional orbital functions
• Developing technologies for debris mitigation

15. India's Major Space Missions

15.1 Chandrayaan Programme

India's lunar programme has progressively expanded India's ability to study the Moon.

Chandrayaan-1

• Focused on lunar exploration.
• Provided important information about the Moon.

Chandrayaan-2

• Included an orbiter, lander and rover components.
• The landing attempt was unsuccessful.
• The orbiter continued to provide scientific information.
• It contributed to observations concerning lunar water, ice and minerals.

Chandrayaan-3

• Launched in 2023.
• Focused on demonstrating a successful lunar landing.
• Included a lander and rover.

16. Gaganyaan and Human Spaceflight

Gaganyaan is India's human spaceflight programme. The programme aims to demonstrate India's capability to send astronauts into space and safely bring them back.

Importance

• Builds indigenous human-spaceflight capability.
• Strengthens India's space technology ecosystem.
• Develops advanced life-support and crew-safety capabilities.
• Creates a foundation for future human space missions.

17. Indian Space Station

The lecture discusses India's longer-term plan to establish a permanent Indian space station after the development of human spaceflight capability.

Potential Significance

• Long-duration human space research
• Microgravity experiments
• Advanced scientific research
• Technology demonstrations
• Expansion of India's human-spaceflight programme

18. Space Tourism

18.1 Sub-orbital Tourism

In sub-orbital tourism, passengers are carried to very high altitudes, experience a brief period of reduced or zero-gravity conditions and then return to Earth.

18.2 Orbital Tourism

Orbital tourism involves taking passengers into orbit and allowing them to remain in an orbital environment for a longer duration.

Challenges

• High cost
• Safety risks
• Legal and regulatory issues
• Health concerns
• Passenger screening
• Emergency management

19. Gravitational Waves and Astronomy

19.1 Gravitational Waves

Gravitational waves are extremely weak disturbances associated with energetic cosmic events. Their detection provides a new method of studying the universe.

19.2 LIGO

The Laser Interferometer Gravitational-Wave Observatory has played an important role in detecting gravitational waves.

19.3 LIGO-India

India is participating in gravitational-wave research through the LIGO-India observatory initiative.

• It is intended to become part of the global gravitational-wave observatory network.
• It will strengthen India's role in fundamental physics and astronomy.
• It can contribute to a better understanding of cosmic phenomena.

20. Neutrinos

Neutrinos are extremely difficult to detect because they interact very weakly with matter. The lecture highlights them as mysterious particles that require specialised experiments for detection and study.

Scientific Importance

• Improves understanding of fundamental particles.
• Helps study astrophysical processes.
• Contributes to understanding the structure and evolution of the universe.

21. Nuclear Technology

21.1 Basic Principle

Nuclear power generation can use the energy released during nuclear fission. The released energy is used to generate heat, produce steam and drive turbines for electricity generation.

21.2 Nuclear Power in India

The lecture describes nuclear energy as an important component of India's electricity-generation mix and discusses India's nuclear reactors and installed capacity.

21.3 Small Modular Reactors

Small Modular Reactors, or SMRs, are compact nuclear reactors designed to provide nuclear power using modular approaches.

Potential Advantages of SMRs

• Smaller unit size
• Modular construction
• Potential deployment flexibility
• Potential application in locations where large reactors are difficult to establish

22. Defence Technology

22.1 Ballistic Missiles

Ballistic missiles generally follow a trajectory in which a major part of their flight follows a ballistic or approximately parabolic path after the powered phase.

22.2 Broad Range Categories Discussed

Category	Approximate Range Discussed
Short Range Ballistic Missile	Up to about 1,000 km
Medium Range Ballistic Missile	Above 1,000 km to about 3,500 km
Intermediate Range Ballistic Missile	About 3,500 km to 5,000 km
Intercontinental Ballistic Missile	Above 5,000 km

22.3 Indian Missile Examples

• Prithvi series
• Agni series
• K-15
• K-4

22.4 Agni-5

Agni-5 is discussed as India's long-range ballistic missile capability. It is associated with the intercontinental-range category in the lecture.

22.5 Submarine-Launched Ballistic Missiles

Submarine-Launched Ballistic Missiles, or SLBMs, provide a sea-based strategic missile capability.

Missile	Category	Approximate Range Discussed
K-15	SLBM	About 750-1,500 km
K-4	SLBM	About 3,500 km

23. Cruise Missiles

Cruise missiles generally fly within the atmosphere and can follow relatively flexible trajectories. They can fly at comparatively low altitudes, making detection more difficult in certain circumstances.

Important Features

• Controlled flight throughout much of the trajectory
• Ability to fly at low altitude
• High precision
• Can be launched from different platforms

Examples Discussed

• BrahMos
• BrahMos-II as a developing hypersonic concept
• Nirbhay
• Long Range Land Attack Cruise Missile (LR-LACM)

24. Hypersonic Technology

A hypersonic system travels at speeds greater than Mach 5.

Strategic Importance

• Very high speed
• Reduced reaction time for an adversary
• Potentially greater difficulty in interception
• Important area of modern defence technology

25. Ballistic Missile Defence

Ballistic Missile Defence systems are designed to detect, track and intercept incoming ballistic missiles.

Indian Systems Discussed

System	Role Discussed
Prithvi Air Defence	High-altitude interception capability
Advanced Air Defence	Lower-altitude interception capability

26. 5G Technology

26.1 Major Features

• Higher data speeds
• Lower latency
• Greater connectivity
• Support for large numbers of connected devices
• Enabler for advanced digital applications

26.2 Applications

• Internet of Things
• Smart agriculture
• Remote monitoring
• Autonomous systems
• Virtual reality
• Augmented reality
• Telemedicine
• Smart cities
• Industrial automation

27. 6G Technology

6G is being explored as the next generation of wireless communication. Applications associated with 5G are expected to become faster and more sophisticated as future networks develop.

Potential Areas

• Ultra-high-speed communication
• Advanced immersive technologies
• Connected devices
• Intelligent transportation
• Advanced industrial systems

28. Challenges Associated with 5G

• Cybersecurity risks
• Privacy concerns
• Device compatibility
• Infrastructure requirements
• Digital divide
• Concerns about electromagnetic exposure

29. Virtual Reality and Augmented Reality

29.1 Virtual Reality

Virtual Reality creates an immersive computer-generated environment in which users can interact with a simulated world.

29.2 Augmented Reality

Augmented Reality overlays digital information or objects onto the user's view of the real world.

Applications

• Education
• Medical training
• Gaming
• Industrial training
• Remote monitoring
• Agriculture
• Entertainment

30. Metaverse

The metaverse refers to an immersive digital environment in which users can interact with digital objects and other users through technologies such as virtual and augmented reality.

Educational Applications

• Three-dimensional learning
• Virtual laboratories
• Medical education
• Visualisation of human anatomy
• Interactive simulations

31. Robotics

Robotics involves the design and use of machines capable of performing tasks with varying levels of autonomy or human control.

Applications

• Manufacturing
• Healthcare
• Defence
• Space exploration
• Disaster response
• Agriculture
• Remote operations

32. Nanotechnology

32.1 Meaning

Nanotechnology deals with materials and structures at extremely small scales, where materials can display properties different from those at larger scales.

32.2 Applications

Sector	Application
Medicine	Targeted drug delivery and advanced diagnostics.
Vaccines	Nanoparticles can be used in vaccine-delivery technologies.
Water Purification	Nanotechnology-based filtration systems.
Electronics	Development of smaller and more advanced electronic components.
Diagnostics	Quantum dots and other nanoscale materials can assist detection.

32.3 Nanorobots

• Potential targeted drug delivery
• Delivery of medicines to specific tissues
• Potential applications in gene-related procedures
• Potential applications in advanced medical treatment

33. Biotechnology

33.1 Meaning

Biotechnology uses biological systems, organisms or biological processes to develop products and technologies useful to society.

33.2 Major Areas

• Healthcare
• Agriculture
• Environment
• Industrial production
• Food and nutrition
• Genetic engineering

34. Colour Classification of Biotechnology

Type	Broad Area
Red Biotechnology	Healthcare and medicine
Green Biotechnology	Agriculture
White Biotechnology	Industrial biotechnology
Blue Biotechnology	Marine resources and applications
Grey Biotechnology	Environmental applications

35. Biotechnology and India's Bioeconomy

Biotechnology is presented as an emerging sector with applications across health, agriculture, industry and environmental management.

Major Opportunities

• Healthcare innovation
• Improved agricultural productivity
• Bio-based industrial production
• Waste management
• Bioremediation
• Employment and economic growth

36. Gene Therapy

Gene therapy attempts to treat disease by modifying or replacing defective genetic material. The lecture explains the concept using the replacement or introduction of healthier genetic material to address disease-causing genetic defects.

Potential Applications

• Inherited genetic disorders
• Certain cancers
• Diseases associated with defective genes

37. Stem Cell Technology

Stem cells have the ability to develop into different types of specialised cells. This makes them important for regenerative medicine and research.

Potential Applications

• Regenerative medicine
• Tissue development
• Organ research
• Treatment research for damaged tissues

Ethical Concerns

• Use of embryonic stem cells
• Status and rights of embryos
• Consent
• Regulation of research

38. Cloning

Cloning involves producing a genetically very similar copy of an organism or biological material.

Possible Applications

• Scientific research
• Conservation-related research
• Study of genetics
• Potential preservation of genetic material

Concerns

• Ethical questions
• Animal welfare
• Loss of genetic diversity
• Possible ecological consequences

39. De-extinction and Genetic Technologies

The lecture discusses the idea of using modern biotechnology and genetic techniques to recreate characteristics of extinct species. Such efforts raise major scientific, ecological and ethical questions.

Key Concerns

• Whether the recreated organism is truly equivalent to the extinct species
• Impact on existing ecosystems
• Animal welfare
• Genetic diversity
• Resource allocation
• Potential ecological disruption

40. Artificial Intelligence

Artificial Intelligence refers broadly to technologies that enable machines to perform tasks requiring forms of human-like intelligence.

Applications

• Healthcare
• Education
• Agriculture
• Governance
• Defence
• Finance
• Communication
• Scientific research

Major Concerns

• Privacy
• Cybersecurity
• Employment disruption
• Algorithmic bias
• Misinformation
• Deepfakes
• Ethical use

41. Supercomputing

Supercomputers are high-performance computing systems designed to perform extremely large numbers of calculations and process complex datasets.

Applications

• Weather forecasting
• Climate modelling
• Scientific research
• Space research
• Defence applications
• Drug discovery
• Artificial Intelligence

42. Quantum Computing

Quantum computing uses principles of quantum mechanics to process information in a fundamentally different way from conventional computers.

Broad Difference

Conventional Computer	Quantum Computer
Uses classical bits.	Uses quantum bits or qubits.
Processes information using classical logic.	Uses quantum mechanical principles.
Suitable for conventional computing tasks.	Potentially powerful for specialised computational problems.

Potential Applications

• Cryptography
• Optimisation
• Drug discovery
• Scientific simulation
• Advanced research

43. Information Technology

Major Emerging Areas

• Artificial Intelligence
• Cloud computing
• Internet of Things
• 5G and future communication systems
• Blockchain
• Cybersecurity
• Virtual Reality
• Augmented Reality
• Metaverse

44. Internet of Things

The Internet of Things connects physical devices and sensors to digital networks so that they can collect, transmit and use information.

Applications

• Smart homes
• Smart cities
• Precision agriculture
• Industrial monitoring
• Healthcare
• Transport

45. Cybersecurity

Increasing digital dependence creates corresponding cybersecurity risks. Sensitive information, communication systems and critical infrastructure can become targets of cyberattacks.

Major Threats

• Hacking
• Data theft
• Malware
• Identity-related attacks
• GPS spoofing
• Attacks on critical infrastructure

Need for Strong Cybersecurity

• Protect personal data.
• Protect government systems.
• Secure financial infrastructure.
• Protect strategic and defence networks.
• Maintain trust in digital services.

46. Semiconductor Technology

Semiconductors are fundamental components of modern electronics and digital infrastructure.

Importance

• Mobile phones
• Computers
• Artificial Intelligence systems
• Automobiles
• Defence equipment
• Communication systems
• Consumer electronics

47. Drones and Unmanned Systems

Drones are unmanned aerial systems that can be remotely controlled or operate with varying levels of autonomy.

Applications

• Agricultural monitoring
• Mapping
• Disaster management
• Surveillance
• Defence
• Infrastructure inspection
• Delivery services

48. Intellectual Property Rights

Intellectual Property Rights protect creations of the human mind, including inventions, artistic works, designs, symbols and other forms of intellectual creation.

Major Forms

IPR	Broad Protection
Patent	New inventions and technological innovations.
Copyright	Original literary, artistic and creative works.
Trademark	Brand names, symbols and distinguishing marks.
Geographical Indication	Products associated with a particular geographical origin.
Trade Secret	Confidential commercial information.

49. IPR and Science & Technology

Scientific and technological innovations require protection because research and development can involve significant time, expertise and financial investment.

Importance

• Encourages innovation.
• Protects inventors.
• Supports commercialisation.
• Encourages investment in research.
• Facilitates technology-based entrepreneurship.

Challenges

• Balancing private rights and public interest
• Access to essential technologies
• Patent disputes
• Protection of traditional knowledge
• Biotechnology-related ethical issues
• International differences in IPR regimes

50. Science and Technology: Major Applications in Daily Life

Technology	Daily-Life Impact
Satellite Communication	Television, communication, internet and emergency communication.
Remote Sensing	Agriculture, mapping, weather and resource management.
Navigation Systems	Travel, transport, location services and emergency response.
5G	High-speed connectivity and connected devices.
AI	Automation, decision support and intelligent services.
Biotechnology	Medicines, vaccines, agriculture and environmental applications.
Nanotechnology	Medicine, filtration, electronics and advanced materials.
Robotics	Automation, surgery, manufacturing and hazardous operations.

51. Major Challenges of Science and Technology

• High research and development costs
• Dependence on imported technologies
• Shortage of highly skilled manpower
• Cybersecurity threats
• Privacy concerns
• Ethical challenges
• Environmental consequences
• Digital divide
• Regulatory uncertainty
• Unequal access to advanced technology

52. Ethical Dimensions

Technological progress must be accompanied by ethical safeguards. Biotechnology, Artificial Intelligence, genetic technologies, autonomous systems and data-driven technologies can create new ethical dilemmas.

• Privacy and informed consent
• Human dignity
• Responsible use of AI
• Genetic modification concerns
• Embryonic stem-cell issues
• Animal welfare
• Algorithmic discrimination

India's Approach to Technological Self-Reliance

Indigenous development of technology is important for reducing excessive dependence on external suppliers and strengthening India's strategic and economic autonomy.

Key Priorities

• Strengthen domestic research and development.
• Promote innovation.
• Encourage industry-academia collaboration.
• Develop skilled human resources.
• Support startups and private-sector participation.
• Improve technological infrastructure.
• Promote indigenous manufacturing.

Role of the Private Sector in Space Technology

The lecture highlights the growing role of private companies in India's space sector and the importance of coordination between government institutions and private enterprises.

Potential Benefits

• Increased investment
• Innovation
• Greater launch capacity
• Commercialisation of space technology
• Employment generation
• Development of a larger space ecosystem

Science and Technology: UPSC Mains Answer Framework

A Science and Technology answer should preferably move from concept to application and then to India's achievements, challenges and solutions.

1. Define the technology briefly.
2. Explain its basic working or principle.
3. Discuss major applications.
4. Mention India's achievements or initiatives.
5. Explain benefits.
6. Discuss challenges and risks.
7. Add ethical, environmental or security concerns where relevant.
8. Conclude with a balanced way forward.

Model Answer Structure

Introduction

Introduce the technology through a short definition and explain why it is currently relevant.

Body

• Meaning and working
• Applications
• Benefits
• Indian achievements
• Challenges
• Ethical and security concerns

Way Forward

• Increase research and development expenditure.
• Promote indigenous innovation.
• Strengthen academia-industry cooperation.
• Develop appropriate regulatory frameworks.
• Improve skilled manpower.
• Ensure responsible and inclusive technological development.

Science and Technology – Quick Revision Table

Topic	One-Line Revision Point
INSAT	Communication and meteorological satellite system.
IRS	Earth observation and remote sensing system.
NavIC	India's regional satellite navigation system.
GAGAN	India's satellite-based augmentation system for navigation.
GPS Spoofing	Deception of navigation systems using false GPS signals.
PSLV	Major Indian launch vehicle with a strong record of successful missions.
GSLV	Launch vehicle using advanced propulsion including cryogenic technology.
LVM3	India's heavy-lift launch vehicle.
RLV	Reusable launch technology intended to reduce launch costs.
5G	High-speed, low-latency communication technology.
AI	Machine-based systems capable of performing intelligent tasks.
Quantum Computing	Computing based on quantum mechanical principles.
Nanotechnology	Technology involving materials and structures at nanoscale.
Biotechnology	Application of biological systems for useful products and processes.
Gene Therapy	Uses genetic modification to address disease-causing defects.
Stem Cells	Cells with the potential to develop into specialised cell types.
Ballistic Missile	Missile that follows a predominantly ballistic trajectory.
Cruise Missile	Guided missile capable of controlled atmospheric flight.
Hypersonic Technology	Technology involving speeds greater than Mach 5.
IPR	Legal protection for intellectual creations and innovations.

Final UPSC Takeaway

Science and Technology should not be prepared as a collection of isolated scientific facts. For Mains, every technology should be connected with its applications, India's development, strategic importance, social impact, environmental consequences, ethical concerns and the need for appropriate regulation.

• Understand the concept.
• Remember important Indian examples.
• Connect technology with governance and development.
• Analyse both benefits and risks.
• Use tables and comparisons for revision.
• Practise application-based answer writing.

Science and Technology – Conclusion

India's progress in Science and Technology is closely connected with economic development, national security, disaster management, agriculture, healthcare, communication and scientific research. Building indigenous technological capabilities while ensuring ethical, secure, inclusive and sustainable use of technology is therefore essential for India's future development.