VB6 is a component/piece of Visual Studio 6. Visual Studio 6 includes:
- Visual Basic 6.0
- Visual C++ 6.0
- Visual InterDev 6.0
- Visual J++ 6.0
- Visual SourceSafe 6.0
Basically, it is the full suite of Microsoft’s programming tools for that version. (As bonus information, keep in mind that this version is prior to .Net coming out and doesn’t allow you to build .Net applications.)
Here is a link to Microsoft’s page for Visual Studio.