Wireless communication technology has developed significantly over the past few
decades and has become one of the most important types of media transmission from
one device to another. Wireless communication (or just wireless, when the context
allows) is the transfer of information between two or more points without the use of
an electrical conductor, optical fiber or other continuous guided medium for the
transfer. The most common wireless technologies use radio waves. With radio waves,
intended distances can be short, such as a few meters for Bluetooth or as far as
millions of kilometers for deep-space radio communications. It encompasses various
types of fixed, mobile, and portable applications, including two-way radios,
cellular telephones, personal digital assistants (PDAs), and wireless networking.
Wireless networking is a method by which homes, telecommunications networks and
business installations avoid the costly process of introducing cables into a
building, or as a connection between various equipment locations.
Admin telecommunications networks are generally implemented and administered using
radio communication. This implementation takes place at the physical level (layer)
of the OSI model network structure.
Examples of wireless networks include cell phone networks, wireless local area
networks (WLANs), wireless sensor networks, satellite communication networks, and
terrestrial microwave networks.