When you set up a blog you have the ability to assign and control what other users can do in the blog depending on the tasks you want each user to be responsible for.
The five roles you can assign users on a blog are, in decreasing level of responsibility:
- Administrator
Has complete power over posts, pages, plugins, comments, choice of theme, settings, assigning user roles, and deleting the site. - Editor
Able to publish and manage posts/pages (including those written by other users), upload files and moderate comments. - Author
Can write and publish their own posts, and upload files. - Contributor
Can write posts but not publish them; these are instead submitted for review to an administrator or editor. - Subscriber
Can read and write comments.
Administrators can give access to others to edit the site.