Which technology is commonly used to extend the range of Wi-Fi?

A repeater is specifically designed to extend the range of Wi-Fi by amplifying and retransmitting the wireless signal. This technology receives the existing Wi-Fi signal, processes it, and then sends out a stronger signal to cover a larger area. This is particularly useful in situations where the original signal is weak due to distance or physical obstructions, such as walls.

While routers and modems are essential components of a network, their primary functions differ. A router connects multiple devices to a single internet connection and manages traffic between them, while a modem is responsible for translating signals from your Internet Service Provider (ISP) into a format that your router can use. A switch, on the other hand, operates at the local network level to connect multiple devices on a wired network, rather than extending wireless coverage.

Given these functions, the repeater serves a unique and critical role in enhancing Wi-Fi coverage, making it the correct choice for this question.