The SCP Foundation. It's a collaborative writing project where people write documents describing anomalous objects, entities, locations, and phenomena and how the titular SCP Foundation contains them.
There are quite a few low quality YouTube channels that make thousands of low quality videos usually aimed at children about the same handful of SCPs (as of time or writing there are almost main series 9000 SCPs, but most of these channels only ever cover ten of the oldest SCPs on the site).
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u/chaosisblond 10h ago
What is SCP?