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Wikilinks

A wikilink or internal link links a page to another page within English Wikipedia.

• [[a]] gives a (link to a, labeled a).
• [[a|b]] gives b (link to a, labeled b). To learn how to type the vertical bar ("pipe" symbol) see Wikipedia:Piped link
• [[a]]b gives ab, just like [[a|ab]] does: ab.
• [[a|b]]c gives bc, just like [[a|bc]] does: bc.
• [[a]]:b gives a:b (punctuation is not appended to the link). The same goes for [[Washington]]'s or e-[[mail]].
• a[[b]] gives ab.
• [[a]]<nowiki>b</nowiki> gives ab.
• [[a]]''b'' gives ab.
• ''[[a]]''b gives ab.
• [[a|b]]c<nowiki>d</nowiki> gives bcd.

Links with a specified label are said to be "piped" because of the pipe symbol used ( | ). For certain types of link, the label will be generated automatically if a pipe is typed with no label after it (thus saving you typing). See Help:Pipe trick.

The link target is case-sensitive except for the first character (so atom links to Atom, but ATom does not). Other ways in which link targets are reinterpreted are described below under Conversion to canonical form.

If the target of a wikilink does not exist, it is displayed red, and is called a red link. If a red link is clicked, the user is taken to a page where it is possible to create a page under the redlinked title. Red links to a particular (non-existent) title can be detected using the What links here feature.

If the target of a link is the same as the page on which it appears (a self-link), it is displayed in bold, as in Help:Link.

Attempting to link normally to an image page, category page or interlanguage link will produce a different effect: it will place the image on the page, add the page to the category or create an interlanguage link at the edge of the page. To override this behavior, add an initial colon, as in [[:File:Mediawiki.png]], [[:Category:Help]], [[:fr:Help:Link]].

Interwiki links

An interwiki link links to a page on another Wikimedia project website, such as Meta or another language Wikipedia. The target site must be on the interwiki map specified for the source wiki. These links have the same [[...]] syntax as wikilinks (see above), but take a prefix which specifies the target site. For example, [[m:Help:Link]] links to the "Help:Link" page on Meta. Links can be piped as with wikilinks. Remember that an interlanguage link should be preceded by a colon if it is to be displayed where it appears in the text; otherwise it will be listed at the side of the page (which is appropriate only if it is the most closely corresponding page in the other language Wikipedia).

Interwiki links (like external links) are displayed in a slightly paler blue than ordinary wikilinks. MediaWiki does not detect whether these target pages exist, so they are never displayed red.

External links

External links use absolute URLs to link directly to any webpage. These links have the associated CSS class "external". External links are in the form [http://www.example.org link name] (resulting in link name), with the link name separated from the URL by a space. Links without link names appear numbered: [http://www.example.org] becomes [1]. Links with no square brackets display in their entirety: http://www.example.org .