An access control list (ACL) contains rules that grant or deny access to certain digital environments. A filesystem ACL is a data structure (usually a table) containing entries that specify individual user or group rights to specific system objects such as programs, processes, or files. These entries are known as access-control entries (ACEs) in the Microsoft Windows NT,OpenVMS, Unix-like, and macOS operating systems. Each accessible object contains an identifier to its ACL. The privileges or p