in telecommunications, wireless communication may be used to transfer information over short distances (a few meters as in television remote control) or long distances (thousands or millions of kilometers for radio communications). The term is often shortened to "wireless". It encompasses various types of fixed, mobile, and portable two-way radios, cellular telephones, personal digital assistants (PDAs), and wireless networking. Other examples of wireless technology include GPS units, garage door openers and or garage doors, wireless computer mice, keyboards and headsets,satellite television and cordless telephones.
Wireless device refers to those equipments in which electromagnetic waves (rather than some form of wire) carry the signal over part or the entire communication path. In this technology information is transferred over a long distances without using wires.
in order to join a wireless LAN (WLAN), a computer must have a wireless network card or adapter installed. A network card is an internal wireless device manufactured to use the same language or protocol that wireless routers use. These protocols periodically evolve into new standards, however, causing compatibility issues in the interim. If a router uses a protocol that is not supported by an internal wireless device, an external wireless adapter can be used in an external port. The most common type is a USB dongle, but wireless network adapters are also available in ExpressCard® formats, giving laptop users a choice as to which port they would rather use.
A wireless device is anything that can transmit signals using an internal radio, such as cellular phones, laptops, wireless cards and wireless routers. Find out how wireless devices function with information from a certifiedcomputer technician in this free video on computers.
source : wikipedia
source : wikipedia
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