How do points work in Team Fortress 2?

Question

I've recently gotten into Team Fortress 2, and for a while now, I've been wondering how points actually work. I've noticed some servers have custom plugins that assign points to players that seem unrelated to TF2's actual point system, but what actions earn you (official) points in the game?

Answer 1

From the official TF2 wiki:

Points are the basic scoring unit of Team Fortress 2, and are awarded for different successful offensive and defensive actions. Performing these actions will also often earn a voice response from the class you are playing.

Points can be awarded in fractions, however these will not show up on the scoreboard until a whole number is reached.

Here is the complete list.