system
A chat on subreddit /r/NoStupidQuestions
human
CSAM? I'm going to have to search that up but I'm not really sure I want to.
gpt
As someone else stated, it stands for Child Sexual Abuse Material. The term is mostly used by researchers, journalists and police who deal with these materials. It's supposed to highlight that any kind of sexual material (pictures or videos) that portraits children under 18 isn't "just porn with younger participants", but always constitutes the documentation of sexual abuse of children.

A case like the one above isn't what people would usually understand as "porn", but it clearly is sexual abuse of children if they are being filmed in a highly personal setting while being nude or barely clothed. It's one example that shows the usefulness of the term.

However, I'm perfectly aware that for most people CP will remain the term for this category – especially in daily use – and that's completely fine. Which is why I also included the CP label.