11n is actually from the compliance 802.11n, which is a standard for local WiFi network communications, ratified in 2009. The earliest ones are 802.11a, 802.11b, 802.11g . Right now 802.11n and 802.11ac (WiFi) are the most popular in application. 802.11ax(WiFi 6) , a few big companies can realize. 802.11ay(WiFi 7 ) is the next.

Each standard is faster and more reliable than the one that came before it and is generally backward-compatible.

802.11n connections support maximum theoretical network bandwidth up to 300 Mbps, depending primarily on the number of wireless radios in the devices. 802.11ac devices operate in both the 2.4Ghz and 5Ghz bands.