Wireless communications are used in a variety of professions.

Although the mix of wireless technologies is continually expanding, the focus of this discussion is on wireless networks that allow users to be mobile. Wireless networks can be classified broadly as:

Click each component in the figure to display more information about the various wireless technologies available to connect devices to these wireless networks:

There are many types of wireless technologies available. However, the focus of this chapter is on 802.11 WLANs.