Black and white thinking is very similar to the All Or Nothing Thinking Trap, it is thinking in extremes. Black or white. Really good or really bad; and not seeing all the possible outcomes in-between (or the “grey”)
All or nothing thinking is when you think if I can’t do it all perfectly, or I can’t fix it all at once, I might as well not even bother.
This is when you tell yourself that you “should”, “ought”, or “must” do something, feel something or behave in a certain way.