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 # Access Control List (ACL) Overview
 
-This topic describes core concepts associated with the optioal access control list (ACL) system shipped with Consul. ACLs authenticate requests and authorize access to resources. They also control access to the Consul UI, API, and CLI, as well as secure service-to-service and agent-to-agent communication.
+This topic describes core concepts associated with the optional access control list (ACL) system shipped with Consul. ACLs authenticate requests and authorize access to resources. They also control access to the Consul UI, API, and CLI, as well as secure service-to-service and agent-to-agent communication.
 
 Refer to the following tutorials for step-by-step instructions on how to get started using ACLs: