ACL is a list of rules regulating access to information. It is an information security tool and a mechanism for determining which users or groups of users are authorized to perform certain operations, such as reading, writing, editing, etc.
ACLs can be used to regulate not only access to data, but also to specific applications or services, such as the Internet, telephony, and video. ACL mechanisms allow you to customize the system usage rights for different groups of users, to set flexible system settings taking into account different conditions.