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IEEE 802.11g is an amendment to the 802.11 standard for wireless LANs. It is of of the specifications that is more commonly known as Wi-Fi.
802.11g has a theoretical throughput of 54 Mbps. It is the successor to the popular 802.11b specification, which has a maximum throughput of 11 Mbps. Both use the 2.4 GHz band, but 802.11g uses OFDM. 802.11g is backwards compatible and supports both 802.11b and 802.11g clients.