A security role defines a collection of security privileges, and a security privilege provides access to an entity or feature. The security features of Microsoft Dynamics CRM 2011—comprised of business units, security roles, and privileges—provide users and teams with access to records or features required to perform their jobs without providing them access to restricted records or features according to your organization's security policy.
Security roles define a collection of entity- and task-based security privileges that can be assigned to users or teams.
When a new Microsoft Dynamics CRM 2011 organization is deployed, 14 standard security roles are included with it. These security roles provide entity- and task-based security privileges for typical job roles in a business.