It is possible to extend the range of 802.11 networks by using repeater technology. In fact, the IEEE 802.11 protocol has clearly defined support for relaying through several modes. For example, the Wireless Distribution System (WDS) allows one access point to not only connect to another access point over a wireless link, but also to serve 802.11 devices at the same time. 802.11b provides the greatest flexibility if bandwidth is of little concern to the application. If serving users and bidirectional transmissions are using the same wireless communication channel, the available bandwidth is substantially cut in half.
In fact, the wireless repeater in the network can be simply said to be a wireless AP in a narrow sense.

AP is the abbreviation of Access Point (Wireless Access Node). It is equivalent to a hub or switch in a wired network. However, it is a hub with wireless signal transmission function, which can provide a conversation meeting point for multiple wireless Internet devices. Wireless AP is a name with a broad meaning. It not only includes a simple wireless access point (wireless AP), but also a general term for devices such as wireless routers. The device is called a wireless AP, and the AP with the router function is called a wireless router.