Administrator is a user role in WordPress. When a user installs WordPress administrator creates a new user with the username and password defined during the installation. That first user is enrolled the user role of administrator. They can perform all actions on a WordPress website and have entire capabilities.
A user with administrator role can add and remove other users with the same role. When assigning the administrator role to a user it is necessary to remember that administrators have the ability to delete content.
Administrator is the only user role that has the ability to boost a WordPress blog. They are capable of changing themes and edit core WordPress files by using the built in theme editor.
In case of a WordPress multisite installation, few of the capabilities of the admin role are assigned to the super admin role. The super admin could modify themes, add new users, and administer the site network while the roles of the admin would only be concerned with managing a single site.