RBACRole-Based Access Control (RBAC) is an approach to restricting system access to authorized users based on their roles within an organization. It simplifies management of user permissions by assigning users to specific roles, with each role granted appropriate access rights.DACDiscretionary Access Control (DAC) is a type of access control mechanism that allows users to control access to their own resources. In a DAC system, resource owners have the ability to grant or revoke access permissions to other users, typically through an access control list (ACL). This model is more flexible but can be more challenging to manage, as it relies on users to make appropriate access decisions.