An algorithm is just a bunch of code.
So, the Youtube algorithm is a bunch of code that takes as its input the videos you’ve watched, and how long you watched them for, and that sort of thing, and its output is the video it recommends you. The videos that show up on your sidebar and homepage.
They don’t say exactly how it works because they don’t want people to try to cheat, but people are always trying to guess. So for example if people think the algorithm seems to be recommending shorter videos to people, then creators might try to make more short videos.
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