The Internet of Things (IoT) is a network of physical devices such as cameras, sensors, wearables, cars, speakers, and home appliances that collect, exchange, or store data. These devices often run embedded software and connect to local networks or cloud services, which makes them useful for automation but also difficult to secure and monitor like traditional computers.
In cyber security, IoT matters because every connected device expands the attack surface. Weak passwords, exposed services, outdated firmware, and insecure mobile apps can let attackers spy on users, steal data, or use a device as a foothold into a larger network. Defenders reduce risk with asset inventory, segmentation, strong authentication, signed updates, and logging. In investigations, IoT devices can also preserve valuable evidence such as timestamps, location traces, and activity history, so preserving integrity and chain of custody is critical.