What Does Asynchronous Transfer Mode (ATM) Mean?

Asynchronous transfer mode (ATM) is a switching technique used by telecommunication networks that uses asynchronous time-division multiplexing to encode data into small, fixed-sized cells.

Techopedia Explains Asynchronous Transfer Mode (ATM)

Asynchronous transfer mode was designed with cells in mind. This is because voice data is converted to packets and is forced to share a network with burst data (large packet data) passing through the same medium.