# Access Control Lists (ACLs)

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An **access-control list (ACL)**, with respect to a computer file system, is a list of permissions attached to an object. An ACL specifies which users or system processes are granted access to objects, as well as what operations are allowed on given objects.
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Each entry in a typical ACL specifies a subject and an operation. For instance, if a file object has an ACL that contains *(Alice: read,write; Bob: read)*, this would give Alice permission to read and write the file and Bob to only read it.

#### Implementations

* Filesystem ACLs
* Networking ACLs
* SQL implementations