How Does The Web Crawler Reach Those Pages If They're Not Linked To?

In Semantic Mastery's weekly Hump Day Hangouts episode 361 (https://www.youtube.com/watch?v=jWuJuUARPS8), one viewer asked how does the web crawler reach those pages if they're not linked to.

The exact question was:

Yes that makes sense. But how does the web crawler reach those pages if they are not linked to?

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