A hype doc is a running note of what you shipped, contributed, and learned. Small wins, team efforts, decisions that went well. You add to it as things happen, not at the end of the year when you need to remember.
The format doesn’t matter. The habit does. When a performance review or a scope conversation comes up, you have something to look at instead of trying to reconstruct six months from memory. Save screenshots feeds the same archive, both are about accumulation, not organisation.