[castratikron]

This is just proportional control. https://en.wikipedia.org/wiki/Proportional_control

[IshKebab]

Yep. It is also known as exponential smoothing in other contexts.

I wish the author had linked to the wikis for either of those things up front so people who had heard of it already (and know why you probably don't want to use it for your UI) could move on.