- An SDK is a collection of files that Visual Studio treats as a single reference item. The **Reference Manager** dialog box lists all SDKs that are relevant to the project that's open when you display that dialog box. When you add an SDK to a project, you can access all of the contents of that SDK through IntelliSense, the **Toolbox**, designers, the **Object Browser**, MSBuild, deployment, debugging, and packaging. For more information about SDKs, see [Creating a Software Development Kit](../extensibility/creating-a-software-development-kit.md).
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