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PageRank
ConceptMentioned in 2 videos
Google's original search algorithm that ranks web pages based on the number and quality of inbound links, treating them as endorsements.
Videos Mentioning PageRank

The Strange Math That Predicts (Almost) Anything
Veritasium
Google's original search algorithm that ranks web pages based on the number and quality of inbound links, treating them as endorsements.

Things That Don't Scale, The Software Edition – Dalton Caldwell and Michael Seibel
Y Combinator
The original algorithm developed by Google for its search engine, based on a paper, which was effective but faced scaling challenges as the internet grew.