what does it do? is it different from C, C++, and Java?
what's the difference of C++ to C++.net / C# to C#.net?
thanks in advance

I don't recall C++.NET, but that is C#, which is just one of the several languages you can use for .NET development, the other is VBscript/VB.NET

.NET is simply the way developers separate code from the XHTML, unlike classic ASP where you can combine the two into one mesh of code. So, designers can work on one part, and developers, another the scripting. It goes on more than that, but I hope I answered your questions.

Bruce
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It's a marketing term. It doesn't mean much, other than the fact that it compiles to CIL/MIL/IL rather than directly to machine code -- in a sense it's closer to Java bytecode than a classical compiled program.

eh? You are talking about ASP.NET (which is just part of the .NET Framework). I know you're simplifying things but its not simply a way to seperate code from design! It also differs from classic ASP as ASP.NET is object orientated, code is compiled, memory managed code etc... , as well as a lot of other differences.

The .NET Framework, provides a development framework within which a developer can create web applications/windows applications/services/tools etc...

You can develop in different languages as once the code is compiled, the resulting MSIL/CIL code produced is the same.