Song not in my playlist started playing?

[yknaa_]

Hi so i use spotify on my android and I was listening to my playlist as i usually do and then songs that aren't even on my playlist (i've never even heard of them before!) started playing?? Skipping it gave me another unknown song! Whats going on?

Edit: I have over 12 songs so there shouldn't be any "suggested songs" in here

[Maxim]

Hey @yknaa_,

Check this out: https://support.spotify.com/using_spotify/features/autoplay/.