[Link]
[[Link]]
[Link|Text]
[Text|Link]
[[Link|Text]]
[[Text|Link]]
http://example.com/

Almost all wikis use square brackets ([[]]) to make links. Using double square brackets allows single square brackets to be used freely without worry of turning them into links.

Using the same markup for both internal and external links makes it easier to learn and remember.

[[Link|Description]]

Raw URLs included in text are distinctive enough to be detected easily. Making them into links saves the users some hassle.

Links in wiki engines

(26) [link] - Clearspace, Confluence, ErfurtWiki, Giki, JSPWiki, KWikiKWiki, Midgard Wiki, Netcipia, nexdo, PBwiki, PhpWiki, ProjectForum, ProntoWiki, ProWiki, ScrewTurn Wiki, SeedWiki, SnipSnap, Socialtext, TracWiki, Wala Wiki, Wiclear, Wikepage, wxWikiServer, XWiki, Zwiki

(23) [[link]] - DokuWiki, EditMe, GeboGebo, IkeWiki, JAMWiki, MediaWiki, miniWiki, Oddmuse, OpenWikiNG, PmWiki, PukiWiki, Qwik, ScrewTurn Wiki, SeedWiki, StikiPad, TiddlyWiki, TWiki, VQWiki, WikiDoc, Wikispaces, WikkaWiki, WikyBlog, Zwiki

(2) ["link"] - MoinMoin, MoniWiki

Links with descriptions in wiki engines

(18) Link first - DokuWiki, ErfurtWiki, GeboGebo, IkeWiki, JAMWiki, MediaWiki, Midgard Wiki, miniWiki, PmWiki, Qwik, ScrewTurn Wiki, TracWiki, TWiki, WikiDoc, Wikispaces, WikkaWiki, WikyBlog, wxWikiServer

(9) Description first - Confluence, Giki, JSPWiki, Netcipia, PhpWiki, PmWiki, PodWiki, PukiWiki, XWiki, Instiki (Textile), ...

Attachments

Links in wiki engines.dat		104 bytes
Links in wiki engines.png		12786 bytes
Links with descriptions in wiki engines.dat		45 bytes
Links with descriptions in wiki engines.png		11182 bytes