Azure Active Directory is an Identity and application management platform that provides a variety of methods for publishing apps for either internal end user or external customer access. The applications deployed the applications deployed via Azure AD can be an On-premises web app, a third-party SaaS application or your own custom developed application.
Azure Ad Connect provides organizations with the ability to synchronize their On-premises users and groups to Azure Active Directory. When synchronizing objects to Azure, administrators have the ability to control which users or groups are synchronized to the cloud. Furthermore, it’s also possible to select which user or group attributes are synchronized. Some organizations may have Security policies that prohibit certain information, such as phone numbers and addresses, from appearing in the cloud. Luckily, attributes can be easily filtered by unchecking the attribute on the AD connector object in Synchronization Service Manager.