A Wi-Fi network is a wireless communication system that allows devices like computers, smartphones, and tablets to connect to the internet without physical cables. It uses radio waves to transmit data between a router and connected devices, enabling users to access online content from various locations within the network's range. Wi-Fi networks are commonly found in homes, offices, and public spaces, providing convenience and flexibility. They operate on different frequency bands, such as 2.4 GHz and 5 GHz, which can affect speed and range. Devices connect to the network using a unique identifier called an SSID, ensuring secure and organized access.