Different users have access to different functions of the site. While anyone can do most things on the site, including reading and editing, staff members can access a few additional functions.
A Bureaucrat has all the powers of an Administrator, with the addition of being able to make other users into bureaucrats or administrators on their wiki. Bureaucrats can also give users the ability to "rollback" edits not made in good faith.
List of Bureaucrats
Administrators can delete and undelete pages, page histories, and uploaded files. They can lock (protecting) a page so it cannot be edited or renamed by users without admin rights or autoconfirmed status and block IP addresses or user names from editing; and very quickly "rollback" undesirable edits. They can also edit the interface by changing system messages and skins.
List of Administrators
In addition to rights and responsibilities of a Rollback, Content Moderators can also protect and delete articles and images to combat vandalism, prevent edit warring and remove spoilers.
List of Content Moderators
Becoming an administrator
For you to become an administrator, someone with bureaucrat access must make you one. On larger Wikia, there will usually be a community page for requests, with a page name such as "GenLOCK Wiki:Requests for adminship". On a smaller wiki, you may simply ask on the community portal or Discussions, or ask a bureaucrat directly on his or her talk page.
If there are no active bureaucrats, use the "Requests for adminship" page to nominate users to become admins or bureaucrats. Once a community decision has been reached (or if there is no active community to debate the decision), please leave a message at the wiki adoption requests page and Wikia Staff can provide the rights.