what is wireless

1.Wireless is a very generic term that may refer to numerous forms of non-wired transmission, including AM and FM radio, TV, cellphones, portable phones and wireless LANs. Various techniques are used to provide wireless transmission, including infrared line of sight, cellular, microwave, satellite, packet radio and spread spectrum.

2.Descriptive of a network or terminal that uses electromagnetic waves (including rf, infrared, laser, visible light–and acoustic energy) rather than wire conductors for telecommunications.

3.A term describing a computer {network} where there is no physical connection (either copper cable or {fibre optics}) between sender and receiver, but instead they are connected by radio. Applications for wireless networks include multi-party {teleconferencing}, distributed work sessions, {personal digital assistant}s, and electronic newspapers.  They include the transmission of voice, video, {image}s, and data, each traffic type with possibly differing {bandwidth} and quality-of-service requirements.  The wireless network components of a complete source-destination path requires consideration of mobility, {hand-off}, and varying transmission and {bandwidth} conditions.  The wired/wireless network combination provides a severe bandwidth mismatch, as well as vastly different error conditions.  The processing capability of fixed vs. mobile terminals may be expected to differ significantly.  This then leads to such issues to be addressed in this environment as {admission control}, {capacity assignment} and {hand-off} control in the wireless domain, flow and error control over the complete end-to-end path, dynamic bandwidth control to accommodate bandwidth mismatch and/or varying processing capability.