IoT (Internet of Things)

IoT (Internet of Things) is a network of physical devices fitted with sensors, software and network connectivity that collect data about their surroundings and exchange it over the internet — often without any human involvement. From smart thermostats and fitness bands, through factory sensors, to entire city control systems, IoT extends internet connectivity to everyday objects and industrial infrastructure.

How IoT works

A typical internet-of-things system consists of several cooperating layers:

1. devices — sensors and controllers that collect data or carry out commands;
2. connectivity — Wi-Fi, cellular networks, Bluetooth or low-power protocols;
3. platform — usually in the cloud, where data is gathered and processed;
4. application — the interface through which a human monitors and controls the devices.

Devices talk to the platform through an API and lightweight messaging protocols. The streams of readings quickly grow to big data scale, which makes scalable storage and analysis essential.

Practical applications

IoT is used in smart homes, industrial monitoring, precision agriculture, logistics, healthcare and energy management. In industry, sensors predict machine failures before they happen, while in cities they optimise traffic and utility consumption. The growing number of connected devices, however, brings challenges: security, data privacy and the need for efficient server infrastructure to handle vast streams of readings. Security is especially pressing, because cheap devices often reach the market with default passwords and no update mechanism, which lets them be hijacked and drafted into botnets used for network attacks. The scale of data generated by IoT, in turn, forces a considered architecture: part of the processing moves closer to the devices, at the network edge, to reduce latency and offload the connection, and only the processed information reaches the central cloud platform. A well-designed internet-of-things system therefore balances the convenience of automation with the rigour of security and scalability.