How to change User Roles and Capabilities in WordPress – User Role Editor
By default WordPress comes with 6 pre-defined roles and many capabilities. Roles define what task users can do within the site and cannot do. These set of tasks called wordpress capabilities. The default wordpress user roles are Super Admin, Administrator, Editor, Author, Contributor and Subscriber.
Super Admin – Full access including network administration.
Administrator – Full site access.
Editor – Publish and manage posts including other users.
Author – Publish and manage their own posts.
Contributor – Write and manage own posts but without publish access.
Subscriber – Manage their profile.