The CLR do some of the important task such as load the IL code of program at runtime. Compile the IL code in native code execute and manage code enforce security and type safety helps in thread support .The code that run in CLR is called unmanaged code .There is an layer which allow both manage code and unmanaged code to interoperate with each other.

The CLR is combination of various components which provides the runtime environment and runtime services for our application .These components loads the IL code into runtime environment and runtime service for our applications.

These components provide multiple task such as type safety and also provide automatic memory management and also helps in threading too. These components also play a sensitive role in exception manager. Some of these components which is generally asked in interview i.e dot net interview questions are as follow:

Class loader: its helps in loading class at runtime.

Security engine: as the name suggest its helps in security restrictions and enforces security.

Code manager: Its works is to manage the code during execution.

Type checker: Its helps CLR to do strict type checking.

COM Marshler: It helps. Net application for exchange data with the COM applications.

Exception Manager: It provides a method to handle the runtime exceptions.

Base class library support: it provides the type which is required at runtime.

Garbage collector: Its performs the automatic memory management and treatment of objects.

MSIL: It converts MSIL to native code and then converts MSIL code into native code.