IEEE 802.11n is an IEEE 802.11 amendment that modifies the physical and media access control (MAC) layer specifications to increase overall throughput for local area networks (LAN), metropolitan area networks (MAN) and wireless local area networks (WLAN).
IEEE 802.11n is also known as IEEE 802.11n-2009.
Techopedia explains IEEE 802.11n
The following are the primary IEEE 802.11n objectives:
Specifies the technique used to increase maximum throughput for transmitting devices up to 600 Mbps, versus 54 Mbps in the preceding standard
Introduces multiple-in/multiple-out (MIMO) technology, frame aggregation at the physical layer and data encoding services
MIMO facilitates the use of multiple source transmitters and receiver node antennae, reduces communication errors and increases data transmission speed, while frame aggregation provisions the simultaneous transmission of multiple frames and reduces communication time.