Help:Links

There are five types of links in MediaWiki:
 * 1) Internal links to other pages in the wiki
 * 2) External links to other websites
 * 3) External links to internal pages in the wiki
 * 4) Interwiki links to other websites registered to the wiki in advance
 * 5) Interlanguage links to other websites registered as other language versions of the wiki

Internal links
To add an internal link, enclose the name of the page you want to link to in double square brackets. When you save the page, you'll see the new link pointing to your page. If the page exists already it is displayed in blue, if it does not, in red. Selflinks to the current page are not transformed in URLs but displayed in bold. (If you really want to link to the current page, use an anchor (see below), or current page which always links to the top.)

The first letter of the target page is automatically capitalized, unless otherwise set by the admins, and spaces are represented as underscores (typing an underscore in the link will have a similar effect as typing a space, but is not recommended, since the underscore will also be shown in the text).

External links to internal pages
To add an external link to a page on the same wiki using parameters, you may need to use external link syntax. Enclose the name of the page you want to link to in single square brackets. When you save the page, you'll see the new link pointing to your page, with an arrow icon after it. This is often useful if you want to link internally on a wiki, but need query parameters in the URL, which may not work with normal internal links in some circumstances.

How to avoid auto-links
By default, when you write a URL as is, it will be transformed to an external link.

To avoid that effect, put the URL between  tags as in: http://mediawiki.org

Interwiki links
Interwiki links are links with the internal link markup to an external wiki website. For example, you can link to the Sunflower article on http://en.wikipedia.org by typing, which will result in a link Sunflower. Unlike internal links, interwiki links do not use page existence detection, so an interwiki link will appear blue even if the page does not exist on the remote wiki.

Similar to internal page links, you can create piped links, with alternate link label, e.g., this is the link big yellow flower.

Basically this is an abbreviation for longer URLs. A very similar link could be created as a normal external link by typing, but interwiki links allow you to type out an easy and compact link, almost as if you are linking to a page on your own wiki.

For a complete list of all wiki projects and there abbreviation, see Special:Interwiki.

Interlanguage links
“Interlanguage links” can be found in the sidebar, just below toolbox in the box named “.”

Interlanguage links behave similarly to interwiki links, except that they are listed in the sidebar. To create an interlanguage link from a page, just type  at the bottom of the page; the language prefix is the prefix specified Special:Interwiki.

If you want to make the interlanguage link appear in the content of the page, you can add a colon before the language prefix:
 * &rarr; en:Sunflower

When link is both interwiki and interlanguage, the order is
 * &rarr; Sunflower.