Microsoft Azure Active Directory Connect

Integrating your on-premises directories with Azure AD makes your users more productive by providing a common identity for accessing both cloud and on-premises resources. With this integration users and organizations can take advantage of the following:

• Organizations can provide users with a common hybrid identity across on-premises or cloud-based services leveraging Windows Server Active Directory and then connecting to Azure Active Directory.
• Administrators can provide conditional access based on application resource, device and user identity, network location and multifactor authentication.
• Users can leverage their common identity through accounts in Azure AD to Office 365, Intune, SaaS apps and third-party applications.
• Developers can build applications that leverage the common identity model, integrating applications into Active Directory on-premises or Azure for cloud-based applications

Azure AD Connect makes this integration easy and simplifies the management of your on-premises and cloud identity infrastructure.

Link: https://www.microsoft.com/en-us/download/details.aspx?id=47594