It’s literally just a set of instructions, usually math based. It’s what order to perform certain calculations in. When you hear about something like “the YouTube algorithm”, they are assigning different weights and metrics to videos based on your watch time and what you watch, and then run a series of calculations to compare that to what other users are watching. The goal is to go “well you like physics content and watch a lot of Physics Girl and Action Lab. Other people that watch Physics Girl and Action Lab also enjoy these creators / topics.”
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