Wikipedia:Tip of the day/June 18
A redirect is a special page that automatically causes the text of another page to be displayed in its place. A redirect that points to another redirect is called a double redirect. These pages are undesirable, since Wikipedia's MediaWiki software will not follow the second redirect, in order to prevent infinite loops. A self-redirect is an article that redirects to itself. These situations create slow, unpleasant experiences for the reader, waste server resources, and make the navigational structure of the site confusing.
Read more: How to fix double redirects