In CentraSite, access control is enabled through a system of roles and permissions. A permission enables a user to perform a specified operation on a specified object. Permissions also enable users to work with specified parts of the CentraSite Control user interface. A role is a collection of permissions that can be assigned to an individual user or a group. The roles to which you belong and the permissions they includes dictate what portions of the CentraSite Control user interface you see, what objects you can work with, and what operations you can perform.