URLs that appear within a document are formatted as links to the given URL. If the URL ends in '.jpg', '.png', or '.gif', then it is instead displayed as an image.

For example, the following:

 http://google.com/
 http://google.com/images/logo.gif

displays as:

http://google.com/
logo.gif

You can change the displayed text to another WikiLink page by using double parentheses around the link and separating the true link and the displayed text with a vertical bar; ((WikiLink|The wiki link page)) becomes The wiki link page.

See LinkingToPoetsNames for more about practical uses for this technique.