The answer is a solution folder.
When you create a new project using visual studio, it will be stored in a solution folder at the location you specify on your computer's disk. A solution folder is a container for one or more related projects. You can create multiple folders in a Visual Studio solution, including nested folders. They appear as expanded and collapsed sections in Solution Explorer.
When you are working on a complex application, it is possible that your solution will contain a large number of projects. This can make it more difficult to navigate the code and quickly switch to the right project. In some situations, you can simplify this navigation by using solution folders.
Learn more about a solution folder:
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