Namely, usually, due to a sound that may have been copied and pasted into another file without editing it at all, which has a beginning and / or final shear wave amplitude in. This is where the famous glitchs occur…

I have heard and read many beatmakers and producers say they got a loop, others who took a sample, but in theory is the same, the difference between these 2 are involved in as, editing:
Loop is defined as the audio is repeated again and again thus creating a “soil” almost ready [...]