.NET Framework = .NET Runtime + .NET SDK + .NET Development + .NET Security

.NET Runtime = CLR (Common Language Runtime) + IL (Intermediate Language) + CTS (Common Type System) + JIT (just-in-time compilation) + assembly (unit of reuse and deployment)

.NET SDK = BCL (Base Class Library) + Rotor (Shared Source Common Language Infrastructure) + ADO.NET + Speech SDK + Media SDK + DirectShow SDK + ...

.NET Development = Visual Studio .NET + XML Core + ASP.NET + .NET Remoting + Mobile and Embedded Development + Messaging + Windows Forms + languages

Mobile and Embedded Development = .NET Compact Framework + SDE (Smart Device Extensions) + Mobile Internet Toolkit + eMbedded Visual Tools + Pocket PC SDK + SmartPhone SDK + Handheld PC SDK

languages = C# .NET + J# .NET + VB .NET + C++ .NET + FoxPro + JScript .NET + Perl + Python + Smalltalk + Java + COBOL + ...