A wireless network means you don't have to be tied to your desk. Depending on the equipment and the plan you choose, you might not even be tied to the office.
Wireless LANs
Traditional wired LANs use cable or wires to send data from one computer to another, or from computer to printer or other device. Wireless LANs do the same thing, except using radio waves. You get the same benefits, without the wires.
Wireless WANs
These networks provide outside-the-office mobile solutions - a premium service for ultimate mobility. They work on the same networks as cellular phones, so you can stay connected almost anywhere.