An Access point connects wireless clients to a wired network, serving as the bridge between the two. It allows wireless devices to access resources on the network, typically providing localized coverage within a broader network infrastructure. A Router is used to connect multiple networks, typically used to connect a local network to the internet. A Switch operates primarily at Layer 2 to interconnect devices within a single network, and a Repeater is used to extend the range of the wireless signal but does not function as a bridge to the wired network.