There were already some great explanations in the replies, but here are a few videos too: Basic overview: https://www.youtube.com/watch?v=mIkIMgEVnX0 https://w

There were already some great explanations in the replies, but here are a few videos too: Basic overview: https://www.youtube.com/watch?v=mIkIMgEVnX0 https://www.youtube.com/watch?v=mIkIMgEVnX0 Or a more detailed one: https://www.youtube.com/watch?v=TwaS5YuTTA0 https://www.youtube.com/watch?v=TwaS5YuTTA0 It's been a standard technique in video games for... decades now.