Q.What do you understand by the Internet of Things? List some of its potential applications.

The Internet of Things (IoT) is a network of physical devices — "things" such as appliances, vehicles, lights and machines — embedded with sensors, software and connectivity, so that they can collect and exchange data and be monitored or controlled over the Internet, often without human intervention.

Potential applications

• Smart home — remotely controlled lights, fans, ACs, door locks, security cameras
• Wearables — fitness bands and smart watches tracking health parameters
• Smart cities — smart parking, smart street lighting, waste and traffic management
• Agriculture — soil-moisture sensors driving automatic irrigation
• Healthcare — remote patient monitoring, connected medical devices
• Transport/Industry — vehicle tracking, predictive maintenance of machines

The idea. Traditionally only computers and phones were connected to the Internet. The Internet of Things (IoT) extends connectivity to everything else — a fan, a car, a streetlight, a water pump. Each "thing" is fitted with sensors (to measure its environment), a small processor with software, and a communication module (Wi-Fi, Bluetooth, mobile network). The devices can then:

1. Sense — collect data (temperature, location, motion, heart rate…),
2. Communicate — send that data over the Internet to apps, servers or other devices, and
3. Act — receive commands or make decisions automatically (switch off, raise an alarm, order a refill), usually without human-to-human or human-to-computer interaction.

Potential applications

• Smart home / home automation — control lights, fans, ACs, geysers and door locks from a phone; security cameras and smoke detectors that send alerts; a fridge that warns when supplies run low.
• Wearables — smart watches and fitness bands that monitor steps, heart rate and sleep, and sync the data to health apps.
• Smart cities — sensor-based smart parking, smart street lights that dim when roads are empty, smart bins that signal when full, real-time traffic and pollution monitoring.
• Smart agriculture — soil-moisture and weather sensors that trigger drip irrigation automatically; livestock tracking.
• Healthcare — remote monitoring of patients' vitals, connected pacemakers and insulin pumps, alerts to doctors in emergencies.
• Transport and logistics — GPS fleet tracking, connected cars, cold-chain monitoring of goods in transit.
• Industry (IIoT) — machines that report their own condition so faults are predicted before breakdown (predictive maintenance).