.NET compilation order and execution

Hi, I'm not really sure how to phrase my question, but I understand that .NET works in several distinct steps to run a project: first, compilation to the CIL (Computer Interface Link), then compilation of that CIL by the JIT compiler to obtain the binary. I have several questions: Is the compiler that generates the CIL specific to the .NET SDK and not present in the .NET runtime? Is the compilation to the CIL performed before the program