The WiFi network uses radio waves to transmit packets of information from place to place. The wired network uses wires, of course. The wires have mostly digital signals on them, not radio wave signals. The WAP is a radio device that reads the digital packets and sends out the corresponding radio signals. It then listens for radio signals and turns them back into digital packets, which it sends into the wired network.
When you pay an ISP to provide you with Internet, they provide it to you with a wire (or optical fiber). This goes into a modem that they give you which operates as a router for your local network. That is typically a wired network, but there are many combo devices with a WAP inside the ISP’s modem box.
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