This one is more for everyone, and it is a simple question: do you take notes about what happens in session, and if so, why do you do it?
Now, the obvious answer is to keep tabs on what is going on in game and having a written record about what transpired so you can refer to it later. I understand this, but some people have other reasons for it.
Personally, when I GM I try to keep notes. It lets me keep track of NPC names (I'm constantly struggling to remember these and finding better ways to do so.) It also lets me keep track of stat blocks for fights, big events, small happenings, and other things I may need to keep my game consistent.
As a player though, I only take notes sometimes. It depends on the character. For this, the notes I take also tend to be in character. They are less a "factual" or "objective" record of the game and more the in character perspective of what happened. While this does let me recall what happened (and from an in game point of view, which helps with RP) it is less about keeping track of what happened and more about interacting with the world and the game in another way that fits the character I'm playing.
What about you? Do you take notes? If so, how detailed are they? What do you get out of them?