Common language runtime is a .NET Framework run-time environment which manages the execution of programs written in any of several supported languages. Microsoft refers to its Common Language Runtime as a “managed execution environment.

Programmers writing in any of Visual Basic, Visual C++,or C# compile their programs into an intermediate form of code called Common Intermediate Language (CIL) in a portable execution (PE) file that can then be managed and executed by the Common Language Runtime.

The CLR’s just-in-time compiler (JIT compiler) converts the CIL code into code native to the operating system.The virtual machine aspect of the CLR allows programmers to ignore many details of the specific CPU that will execute the program.

The CLR also provides other important services,such as Memory management,Thread management,Exception handling,Garbage collection,Security.

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