Answer:   CLR stands for Common Language Runtime. It is one of the most important components of the .Net framework. It provides building blocks for many applications.
An application built using C# gets compiled by its own compiler and is converted into an Intermediate language. This is then targeted to CLR. CLR does various operations like memory management, security checks, assemblies to be loaded and thread management. It provides a secure execution environment for applications

Answer:   CLR is the basic and Virtual Machine component of the .NET Framework. It is the run-time environment in the .NET Framework that runs the codes and helps in making the development process easier by providing the various services. Basically, it is responsible for managing the execution of .NET programs regardless of any .NET programming language. Internally, CLR implements the VES(Virtual Execution System) which is defined in the Microsoft’s implementation of the CLI(Common Language Infrastructure).
The code that runs under the Common Language Runtime is termed as the Managed Code. In other words, you can say that CLR provides a managed execution environment for the .NET programs by improving the security, including the cross language integration and a rich set of class libraries etc. CLR is present in every .NET framework version.