[thejohnconway]

To stretch the analogy a bit: it’s like virtual memory. Not as fast as RAM, but there’s an effectively infinite amount of it.

[maxxxxx]

Probably a good analogy. And it's also incredibly slow so you need to have a good amount of RAM and CPU cache.

[blub]

Since one's brain is not able to translate a thought into a search engine query which leads straight to the answer, that virtual memory analogy doesn't work at all.