Difference between CLS and CTS

What is a CLR?
Full form of CLR is Common Language Runtime and it forms the heart of the .NET
framework.All Languages have runtime and its the responsibility of the runtime to take care of
the code execution of the program. Java has Java Virtual Machine, Similarly .NET has CLR.The responsibilities of CLR are Garbage Collection, Code Access Security, Code Verification, IL( Intermediate language ).


What is a CTS?
In order that two language communicate smoothly CLR has CTS (Common Type System). In order that two different languages can communicate Microsoft introduced Common Type System. So “Integer” datatype in VB6 and “int” datatype in
C++ will convert it to System.int32 which is datatype of CTS.

What is a CLS(Common Language Specification)?
This is a subset of the CTS which all .NET languages are expected to support.Microsoft has defined CLS which are nothing but guidelines that language to follow
so that it can communicate with other .NET languages in a seamless manner.