Communication, Mobile & Social Media

ICT Communication

What is ICT?

ICT (Information and Communication Technology) refers to all technologies used for handling information and enabling communication — computers, the internet, smartphones, telecom networks, and software applications.

ICT has transformed agriculture through e-governance portals (Soil Health Card, PM-KISAN), mobile advisory services, and digital market platforms (eNAM).

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Types of Communication

Communication refers to the exchange of data between two devices. Based on the direction of data flow, there are three modes:

Memory Aid: TV is Simplex (one-way Signal), Walkie-talkie is Half (you Hold and talk), Phone is Full (both talk Freely)

Digital vs Analog Communication

Bandwidth

Bandwidth is the maximum amount of data that can be transmitted over a communication channel in a given time. It is measured in bits per second (bps) — Kbps, Mbps, Gbps.

• Higher bandwidth = faster data transfer
• Broadband: High-speed internet (typically 256 Kbps or more)

Data Transmission Modes

• Serial is slower but works over longer distances
• Parallel is faster but only for short distances (within a computer)

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Mobile Communication

Evolution of Mobile Networks

5G Key Features

• Speed: Up to 10 Gbps — 100x faster than 4G
• Latency: As low as 1 millisecond (near real-time)
• Massive IoT support: Can connect millions of devices per square kilometer
• Applications: Self-driving cars, remote surgery, smart farming, AR/VR
• India launched 5G in October 2022 (Jio and Airtel)

GSM vs CDMA

SIM Card

SIM (Subscriber Identity Module) is a small chip that identifies the user on a mobile network.

• Stores: phone number, contacts, network authentication data
• Types: Standard SIM, Micro SIM, Nano SIM
• eSIM — embedded SIM built into the phone, no physical card needed, can switch carriers digitally

WiFi Standards

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Mobile Sensors

Modern smartphones contain numerous sensors that enable various features. This topic has appeared in AGTA exams.

GPS Details

GPS (Global Positioning System) uses a network of 24+ satellites orbiting Earth to determine precise location.

• Developed by: US Department of Defense
• Accuracy: Within 3-5 meters
• India’s own system: NavIC (Navigation with Indian Constellation) — 7 satellites by ISRO
• Uses: Maps, agriculture (precision farming), disaster management, vehicle tracking

NFC Details

NFC works within a range of 4 cm or less. It is used for:

• Contactless payments (tap and pay)
• Metro/bus smart cards
• Sharing files between phones (tap to share)
• Smart tags and access cards

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Social Media

Major Platforms

Social Media Algorithms

Social media platforms use algorithms to decide what content appears in your feed. They prioritize content based on:

• Engagement — posts with more likes, comments, shares appear higher
• Relevance — content matching your interests and past behavior
• Recency — newer posts get priority
• Relationships — content from close friends/frequent contacts ranks higher

Filter Bubble and Echo Chamber

Both can lead to a narrow worldview and increased polarization.

Digital Footprint

Your digital footprint is the trail of data you leave behind when using the internet.

Online Safety

Online Threats

Social Media in Governance

The Indian government actively uses social media for citizen engagement:

• MyGov.in — citizen participation platform
• Twitter/X — official government announcements, disaster alerts
• YouTube — PM addresses (Mann Ki Baat)
• WhatsApp — government chatbots for information delivery
• Digital India — initiative promoting ICT in governance

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Li-Fi — Light-Based Communication

Li-Fi (Light Fidelity) uses LED light for data transmission instead of radio waves (WiFi).

Exam tip: Li-Fi uses light; WiFi uses radio waves. Li-Fi is faster but works only in line-of-sight.

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5G Bands in India

• Jio uses both sub-6 GHz and mmWave
• Airtel primarily uses sub-6 GHz band

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VoLTE & WiFi Calling

Exam tip: VoLTE = calls over 4G; WiFi Calling = calls over WiFi. Both provide HD voice quality.

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OTT Platforms

OTT (Over-The-Top) platforms deliver media content directly over the internet, bypassing traditional cable/satellite distribution.

• OTT platforms are regulated under IT Rules 2021 in India
• Must have a grievance officer and content classification system

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Digital Wellbeing

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Right to Privacy & IT Rules

Right to Privacy

The Supreme Court of India declared the Right to Privacy as a Fundamental Right under Article 21 in the landmark Justice K.S. Puttaswamy vs Union of India case (2017).

• 9-judge bench — unanimous decision
• Privacy is intrinsic to life and personal liberty
• Led to the formulation of the Digital Personal Data Protection Act, 2023

IT Rules 2021 (Intermediary Guidelines)

IT (Intermediary Guidelines and Digital Media Ethics Code) Rules, 2021 regulate social media and OTT platforms.

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Deepfake

Deepfake refers to AI-generated fake videos, audio, or images that appear extremely realistic.

Exam tip: Deepfakes are a growing cybersecurity concern — they can be used for identity theft and spreading fake news.

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Key Takeaways

• ICT encompasses all technologies for information handling and communication
• Simplex = one-way (TV), Half-duplex = one at a time (walkie-talkie), Full-duplex = both ways (phone)
• Mobile networks: 1G (analog voice) → 2G (SMS, GSM) → 3G (video calls) → 4G/LTE (HD streaming, VoLTE) → 5G (10 Gbps, 1ms latency)
• 5G bands: Sub-6 GHz (wider coverage, building penetration) and mmWave (ultra-fast, short range)
• VoLTE = HD voice calls over 4G; WiFi Calling = voice calls over WiFi when mobile signal weak
• Li-Fi uses LED light for data, up to 224 Gbps (lab), coined by Harald Haas (2011), line-of-sight only
• GSM uses SIM cards; eSIM = embedded, no physical card; SIM types: Standard, Micro, Nano
• Accelerometer = motion/tilt (auto-rotate); Proximity sensor = screen off during calls; GPS = 24+ satellites
• NFC = contactless payments within 4 cm; NavIC = India’s satellite navigation (ISRO, 7 satellites)
• OTT platforms (Netflix, Hotstar) deliver content over internet — regulated under IT Rules 2021
• Digital footprint = active (you share) + passive (tracked by websites)
• Filter bubbles and echo chambers limit exposure to diverse viewpoints
• Digital Detox = reducing device usage for mental health; Nomophobia = fear of being without phone
• Right to Privacy = Fundamental Right under Article 21 (Puttaswamy vs Union of India, 2017, 9-judge bench)
• IT Rules 2021: Grievance Officer (15 days), traceability, content removal (36 hours), OTT classification
• Deepfakes = AI-generated fake media using GANs — risks: misinformation, identity fraud

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Summary Cheat Sheet