Final answer:
An ACL is a list that specifies which subjects are allowed to access an object and what operations they can perform on it.
Step-by-step explanation:
List of Access Control Lists (ACL)
An ACL is a list that specifies which subjects are allowed to access an object and what operations they can perform on it. It acts as a set of rules or permissions. These lists are commonly used in computer security to control access to files, databases, or network resources. For example, in a computer network, an ACL can be used to determine which users can access a specific folder and what actions they can perform, such as read, write, or delete files. Overall, an ACL is a powerful tool for managing access rights and enforcing security policies in various computer systems.