A Wireless Access Point (WAP) allows several devices to connect via WiFi to a single network. The wired equivalent is a switch. But unlike a switch, a WAP does not need to be wired to the router. Access Points connect via wired Ethernet to a switch, or a switch port on a router, then serve up WiFi. Many manufacturers sell WAPs that connect via WiFi and do not need to be wired to the router, but these are usually called repeaters or extenders or a mesh network.
An Access Point (AP) or WAP is sometimes referred to as anything that your device can connect to wirelessly, to access a network. But technically, a router is wired to the network, and an AP can be wired or not to a router. Other connectivity points that are meant to extend the network range are connected to the AP via WiFi, and are called extenders or repeaters. If you wish to expand your home network, you do not need a repeater wired to the router.
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