YouTube Mix

Mixes appear as a playlist tile with a looping icon and no stated length. YouTube builds one from a seed, usually a song, artist or channel, then keeps appending whatever it expects that viewer to want next, so two people starting from the same track get different lists. Music channels see this most, since music viewing skews heavily towards playlists and autoplay while how-to material leans on search. You cannot submit a video to a Mix or edit one, and in Studio the views arrive labelled as playlist or suggested traffic depending on how the viewer got there.