Visual studio can integrate with MS Team Foundation Server to manage source code and ALM. Team Foundation Server organizes its data in project collections that contain Team Projects. Team Project may contain many visual studio solutions.
when working, we have one collection Project, and each Team project is a complete system that we created, containing one or more solutions.
Keep in mind that TFS is a separate product, so you need a separate license to launch it, and its bear for installation and maintenance.
There are several reasons to use TFS, but the most important thing is the ability to control code access by several developers. It controls checks, checks, merges, and history / version management. These functions can be useful for one developer, but, as the name implies, the general sense is that the development team can collaborate in the system.
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