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An Access Control Entry (ACE) within a discretionary access control list (DACL) represents the permissions granted to a specific user or group regarding a particular resource, such as a file or folder. Each ACE comprises several components, including the security identifier (SID) for the user or group, the type of access (allow or deny), and the specific permissions (such as read, write, or execute) that apply to that user or group.

The DACL contains a collection of these ACEs, which collectively dictate who has permission to access the resource and what level of access they have. This mechanism allows for fine-grained control over resource access, enabling system administrators to tailor access rights according to various user needs and security policies.

Understanding the role of ACEs is crucial for those managing information security and compliance, as they lay the groundwork for implementing organizational access policies and ensuring that sensitive data is protected from unauthorized access.