Wireless networks transfer data from computer to computer, or from computer to other equipment using radio waves, which can pass through floors and ceilings and around walls. The two main building blocks of the network are access points and client adapters.

Access Points and Bridge Routers
These devices are the data transfer stations in the network. They operate just like a hub in a wired network, connecting multiple computers and devices together, but without wires. They also provide a bridge between the wireless network and a previously existing wired network. Bridge routers are access points that also provide a connection for a high-speed modem and basic routing capability for several computers.

Client Adapters: PC cards, USB devices and modules
Wired or wireless, every network uses adapters. Whether they are removable cards for notebooks or USB adapters for desktops, they are the link between the computer and the network. If you have hardware already integrated with a wireless adapter, you won't need a separate adapter.