A role assignment is a virtual container for application groups whose members are authorized for the role. A role assignment is based on a single role definition, and a single role definition can be the basis of many role assignments.
The most common procedure that administrators carry out is the assignment of application groups, or Windows users and groups, to a role. For step-by-step instructions, see Assign a Windows User or Group to a Role or Assign an Application Group to a Role.
If you have installed a custom object picker, additional choices will be available. For more information, see "Additional references" in this topic.