Individual drum sounds are usually sampled and assigned to Midi notes and can be played on a keyboard, drum pad, computer screen etc.
Audio Drum loops are a recording of a real drummer playing a real drum kit, with each variation etc. having its own dedicated loop, however software is available that can split the audio drum loop into its component parts allowing it to be assigned like a normal Midi Drum Sample. (A common format where this is done for you are REX files which contain the full loop and the data to access each part of the loop https://fileinfo.com/extension/rex)
Hope this helps