API Reference Guides
Explore our extensive collection of guides to understand and effectively use Microsoft's APIs.
.NET Framework API Reference
Detailed documentation for the .NET Framework class library, including namespaces, classes, methods, and properties.
Explore .NET APIWindows API Reference
Learn about the Win32 API and other Windows system services to build powerful desktop applications.
Explore Windows APIAzure Services API
Discover the APIs for various Azure services, enabling you to build and manage cloud solutions.
Explore Azure APIMicrosoft Graph API
Access data and intelligence across Microsoft 365, Windows, and Edge with the unified Microsoft Graph API.
Explore Graph APIOffice Add-ins API
Understand the APIs available for creating add-ins for Office applications like Word, Excel, and Outlook.
Explore Office Add-ins APIVisual Studio Extensibility
Documentation for building extensions and tools for the Visual Studio IDE.
Explore VS Extensibility