Role-based access control (RBAC) is a method of regulating access to computer systems and data based on the roles assigned to individual users within an organization. Each role corresponds to specific access permissions that determine what resources and actions a user is allowed. RBAC simplifies user permissions management by grouping users with similar access needs into roles rather than assigning permissions individually. This approach enhances security by ensuring that users only have access to the information and systems necessary for their job functions, reducing the risk of unauthorized access and improving compliance with security policies.