What does punk mean in slang?

Hey there, I'm curious about the slang term 'punk'. I've heard it used in various contexts, but I'm not entirely sure what it means. Could you shed some light on this for me? Is it a derogatory term, or can it be used in a positive sense as well? And are there any specific subcultures or movements that the term is closely associated with? I'd really appreciate your insights on this.