Active Directory $-$ What is an active directory and what does it do$?$

Active Directory is a Microsoft directory service that mainly uses Kerberos as its directory protocol and is used to store and maintain user information$/$data$/$access in a centralized location

Active Directory is a Microsoft service that is used to actively update outdated software and prevent software vulnerabilities

Active Directory is a common web protocol that is used to store user cookies

Active Directory is a Microsoft directory service that mainly uses TCP$/$IP as its directory protocol and is used to store and send user data packets that are sent between networks