VS is Visual Studio, it is a tool set provided by Microsoft, composed of various tools. VS can support C/C++, VB, JAVA, C# programming. However, only one programming method can be supported at a time. After the VS installation is complete, you will be asked to choose a common language when you run it for the first time. If you choose C/C++, then it becomes a platform capable of C/C++ programming. Maybe it is what you call VC. If you don't want to use C/C++, you only need to modify his initial settings and choose another programming language to become a programming environment for another language.
VC is Visual C++, an independent C/C++ development tool. The more famous one is VC6.0, and the current VC2010 is actually VC10.0.
To make it more popular, take VS2010 and VC2010 as examples. VS2010 is equivalent to Office2010, including World2010, Excel2010, etc., while VC2010 is equivalent to World2010.