802.11 Wi-Fi | 802.11abgn
IEEE 802.11 is a set of standards for implementing wireless local area networks. 802.11b operates in the 2.4 GHz frequency band and utilizes DSSS (Direct Sequence Spread Spectrum) modulation for up to 11 Mbps data rate. 802.11a operates in the 5 GHz frequency band and utilizes OFDM (Orthogonal Frequency Division Multiplexing) modulation for up to 54 Mbps data rate. 802.11g operates in the 2.4 GHz frequency band and utilizes OFDM and DSSS modulation for up to 54 Mbps data rate. 802.11n operates in both the 2.4 GHz and 5 GHz frequency bands, utilizes OFDM modulation, and uses advanced technologies including MIMO (Multiple-Input Multiple-Output) spatial multiplexing to increase throughput and range. The 802.11abgn specifications are collectively and individually referred to as Wi-Fi.
Wi-Fi is commonly used in laptop computers, tablet computers, smart phones, portable gaming devices, cameras, remote controls, clocks, and many other devices. Wi-Fi ’hotspots’ are found in the workplace, at home, and are increasingly popping up in airports, restaurants, coffee shops, libraries, and other public places.