A Wi-Fi system is a technology that allows devices to connect to the internet wirelessly. It uses radio waves to transmit data between a router and various devices like smartphones, laptops, and tablets. This enables users to access the internet without needing physical cables, providing convenience and mobility. Typically, a Wi-Fi system consists of a modem that connects to the internet and a router that distributes the signal throughout a home or office. The range and speed of the connection can vary based on factors like the type of router, the number of connected devices, and physical obstructions like walls.