Access Control List (ACL)

An access control list is the usual means by which access to, and denial of, service is controlled. It is simply a list of the services available, each with a list of the hosts permitted to use the services. Most network security systems operate by allowing selective use of services. Mechanism implementing discretionary and/or mandatory access control between subjects and objects. The column of an access control matrix that specifies what level of access each subject has over an object.