In .Netframework how CLR(Commom language runtime) has work???

1st--- CLS (common language specification) 
2nd-- CTS (common type system) 
cts will check line by line typesafty checking. 
3rd-- JIT (just in time) JIT will change the code into MSIL 
4th-- MSIL (Microsoft Intermidiate language) MSIL will change the code in .exe 

and we run the .exe files....