NuGet is a package manager for the Microsoft .NET platform, designed to simplify the process of incorporating third-party libraries and tools into .NET applications. It allows developers to easily find, install, and update these packages, which can include code, resources, and other dependencies needed for their projects. With NuGet, developers can manage their project dependencies efficiently, ensuring that they have the correct versions of libraries. It also supports versioning, making it easier to roll back to previous versions if needed. Overall, NuGet streamlines the development process and enhances productivity for .NET developers.