A Wi-Fi router is a device that connects to the internet and allows multiple devices, like smartphones, laptops, and tablets, to access the internet wirelessly. It creates a local network by sending and receiving data through radio waves, enabling users to browse the web, stream videos, and play online games without needing physical cables. Most Wi-Fi routers come with various features, such as security settings to protect your network and parental controls to manage internet access for children. They can also support different Wi-Fi standards, which determine the speed and range of the wireless connection, ensuring a reliable internet experience for all connected devices.