The 802.11 family is a series of Wireless Local Area Network standards specified by the Institute of Electrical and Electronics Engineers. It includes multiple physical layers as well as a common medium access. The first standard was ratified in 1997 and defined physical layers for infrared together with 2 spread spectrum methods in the 2.4 Ghz frequency band. 1999 the amendments 802.11a and 802.11b introduced Orthogonal-Frequency-Division-Multiplexing (OFDM) in the 5 GHz frequency band along with an improvement of the data rate in the 2.4 Ghz band. In 2003 OFDM was also specified for the 2.4 GHz band with 802.11g.
After a huge success of the previous standards, 802.11n was introduced in 2009 and brought a list of new features being: