An inbound link to a page is a link from some other place on the internet to that page. By "some other place" we mean not a different page on this wiki, but some other site altogether. For example: Someone on a series forum says that The Reveal in the latest episode was a total Ass Pull, and gives links to TV Tropes with both terms so other people in the forum (who are not necessarily familiar with TV Tropes jargon) will know what he is talking about.