On the "Visual Studio Express 2010" disk VS2010Express.iso which I downloaded from Microsoft it turned out that Visual Studio Express consist of:
Visual C#,
Visual Basic,
Visual C++,
"Visual Web developer".
So to answer the original question here I think that Visual Web developer is one part of the whole disk called Visual Studio. But don't go there if you do not have to:
I am currently upgrading from Visual Studio 2008 because of the bug in .Net 2.0 / 3.5 related to not being able to work with (not recognizing) Internet Explorer 10, but now I get bugs related to App_GlobalResources. The whole Globalization function just does not work anymore. I am in a Hackathon nightmare of 48 hours trying to survive. I think that MS wanted to get you all on board with the free express edition but it is payback time now. I think I am going back to Uniface which is upward compatible. Once again, there is no such thing as free!!!