Wireless Band & Chanel Width Meaning

RouterOS Wireless Networking
1

Hello,

I’m new to networking and cannot find any documentation on these two things. Can some explain the meaning of each one for the Band and the Chanel Width? I’m using a hap ac lite by the way.
chanelwidth.png
band.png

2

https://help.mikrotik.com/docs/display/ROS/Wireless+Interface