Role-based access control (RBAC) is an approach used to restrict access to certain parts of the system to only authorized users.
The permissions to perform certain operations are assigned to only specific roles. Users of the system are assigned those roles, and through those assignments, they acquire the permissions needed to perform particular system functions. Since users are not assigned permissions directly, but only acquire them through the roles that have been assigned to them, management of individual user rights becomes a matter of simply assigning appropriate roles to a particular user.
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