Microsoft Graph is a unified gateway that provides access to data across Microsoft 365, Windows, and Enterprise Mobility + Security services. It offers a single endpoint via the Microsoft Graph API to access people-centric data and insights through REST APIs and SDKs. Microsoft Graph connectors bring external data into Microsoft services to enhance experiences, and Data Connect caches Graph data in Azure for building intelligent apps. Together, the API, connectors, and Data Connect power the Microsoft 365 platform by enabling access to insights and the ability to build custom applications.