Wikitext is the markup language used to format content on wikis.
It can be used to add photos, tables, bold styles, links, and
other visual changes. It's not necessary to know wikitext in
order to edit at Wikia. You can use the Visual mode in the
editor to avoid it. However, users who learn it find that they
have more control over their editing experience. It can be used
in "source" mode in the editor. Here's a cheat sheet for basic
wikitext that you can use while editing.