This document discusses integrating MongoDB with Azure Active Directory Domain Services. It provides an overview of using Azure AD Domain Services to enable LDAP authentication for applications migrated to Azure, allowing them to use existing on-premises Active Directory credentials. Key points include that AD Domain Services provides a managed Active Directory in Azure that is compatible with on-premises AD and allows applications to authenticate users via LDAP or LDAPS without needing to modify applications. The document also references migrating line of business applications that use LDAP authentication to Azure virtual machines joined to the AD Domain Services domain.