A red link in a Wiki article is a link that leads to a non-existent article. In other words, it leads to nowhere. These links are colored red on the Wiki to make notice that they lead to nowhere. If red links are found in Wiki articles, they should either be removed to modified to link to an article that actually exists. For example, the links below are all red links:
The following links are real links, which is why they are shown in blue instead: