Wikipedia:Red link

A red link, like this example, signifies that the linked-to page does not exist—it either never existed, or previously existed but has been deleted.

Most new articles are created shortly after a corresponding reference to them is entered into the system.

Spinellis and Louridas, "The Collaborative Organization of Knowledge"[1]

It is useful while editing articles to add a red link to indicate that a page will be created soon or that an article should be created for the topic because the subject is notable and verifiable. Red links help Wikipedia grow.[1] The creation of red links prevents new pages from being orphaned from the start.[2] Good red links help Wikipedia—they encourage new contributors in useful directions, and remind us that Wikipedia is far from finished.

Articles should not contain red links to files, to templates, or to topics that do not warrant an article, such as a celebrity's romantic interest who is not notable in their own right. Red links should not be made to every chapter in a book. Red links should not be made to articles deleted because the topic was judged unencyclopedic or lacking notability. Red links may sometimes be created to articles deleted for some other reason. In addition, even if a page has been deleted because it does not meet Wikipedia's guidelines, you may make a red link to the term if you intend to write an article about an entirely different topic that happens to have the same title.

In general, a red link should remain in an article if it links to a title that could plausibly sustain an article, but for which there is no existing article, or article section, under any name. Only remove red links if Wikipedia should not have an article on the subject. It may be possible to turn the red link into a redirect to an article section where the subject is covered as part of a broader topic (see Notability – Whether to create standalone pages).