Apple Loops / Garageband Loops

What is Apple Loops format?

These are audio recordings of musical patterns (drum loops, guitar riff…) that can be played in a constant repeat mode, over and over. This technology allows to change key and tempo of the loop file. That way you can match a song key or tempo within Logic Pro X or Garageband software. Many other digital audio workstations also support the format. The file extensions are .aiff or .aif