What is WLAN (WiFi) channel?

This list of WLAN channels is the set of legally allowed wireless local area network channels using IEEE 802.11 protocols, mostly sold under the trademark Wi-Fi.

The 802.11 workgroup currently documents use in five distinct frequency ranges: 2.4 GHz, 3.6 GHz, 4.9 GHz, 5 GHz, and 5.9 GHz bands.^[1] Each range is divided into a multitude of channels. Countries apply their own regulations to the allowable channels, allowed users and maximum power levels within these frequency ranges. In some countries, such as the United States, licensedAmateur Radio operators may use some of the channels at much higher power for long distance wireless access.

For more information, please refer to the original article on Wikipedia: 

https://en.wikipedia.org/wiki/List_of_WLAN_channels