Hyperbolically, I think it's one of humanity's greatest resources. I can find anything from precision machining, LLM internals, historical footage of WWI, music performances from pretty much any era, and on, and on. There are so many things that I didn't know there was any footage of or that I didn't a single thing about that I find there pretty much daily.

I wish the BBC would publish their whole archive through YT. The few things that they do put up are often so mind expanding whether it's Berty Russel, The Beatles, or some cracking Scottish chap going for a bike ride with a bottle of whisky.