You should probably be more specific about what you want to know. The basic concept, or operation, or what?
More information than you could possibly need, written mostly in layman’s terms, is written in the Wikipedia article on the subject: [https://en.wikipedia.org/wiki/Thread_pool](https://en.wikipedia.org/wiki/Thread_pool)
People who post to ELI5 about technical topics should at least look at Wikipedia first. Chances are pretty good that it has the answers.
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