CLR is the core of the .NET Framework. In particular, CLR manages and executes .NET applications.
.NET executables (applications and shared libraries) contain metadata and MSIL code. The JIT compiler is used to convert the MSIL code into platform-specific executables, on execution.
CTS and CLS define common types and rules for language interoperability. The .NET programming model supports both value types and reference types. The .NET programming model takes language interoperability beyond what has been achieved by COM interfaces, providing true interoperability. For instance, classes developed in one programming language can be inherited in a different programming language.
