What is CLR and Its functionality?

1) Is a heart of .net framework and Its a runtime execution engine
2) Services Provided by CLR
–Code management (loading and execution)
–Application memory isolation
–Verification of type safety
–Conversion of IL to native code
–Access to metadata (enhanced type information)
–Managing memory for managed objects
–Enforcement of code access security
–Exception handling, including cross-language exceptions
–Interoperation between managed code, COM objects, and pre-existing DLLs (unmanaged code and data)
–Automation of object layout
–Support for developer services