Can you tell Guys about the managed and unmanaged code in .net?

Friend,the .NET Framework provides a run-time environment called the Common Language Runtime, which manages the execution of code and provides services that make the development process easier.
Compilers and tools expose the runtime’s functionality and enable you to write code that benefits from this managed execution environment. Code that you develop with a language compiler that targets the runtime is called managed code; it benefits from features such as cross-language integration, cross-language exception handling, enhanced security, versioning and deployment support, a simplified model for component interaction, and debugging and profiling services