Exposure and lightness
One of the principal concepts of photography is exposure. It's one of the first pieces of jargon that a photographer adopts to denote membership of the club. Show a non-photographer a shot that looks too dark and they'll likely say ‘that's too dark. Show it to a photographer and they'll say ‘that's underexposed' Oddly, the lay person is quite likely to be correct, because underexposure is only one possible cause of
