WAV FILES

WAV LOOPS are audio files as they are most common in the audio field, they don't take much CPU or VST instrument CPU and still offer top quality.
Here, too, there are not as many creative possibilities as with a midi loop.
You can edit an audio file with effects, chop / slice, but with experience you can produce a whole song from a single WAV file / audio wav loop.
Creativity and experience with the instruments, the DAW and the hardware is of course an enormous advantage here.