You use the Active Directory type external source to retrieve information on users and user groups from an Active Directory. The Active Directory organizes corporate information on users, machines, and networks in a structural database.
You use the Lightweight Directory Access Protocol (LDAP) type user source to retrieve information on users and user groups from a LDAP Server. The LDAP Server facilitates users and directory services over an IP network and provides Web Services for Application Protector.
You use the Azure AD type external source to retrieve information for users and user groups from an Azure AD. The Azure AD organizes corporate information on users, machines, and networks in a structural database.