JIT full form is Just in Time, a Compiler in .NET Framework.
JIT (just in time) compiler is a part of clr (common language runtime) in .net framework, jit is responsible for managing the execution of .net programs regardless of any .net programming language (c#, j#, vb etc.) There are various steps in managed execution process.
A language-specific compiler converts the source code to the intermediate language.
Then the intermediate language is converted into the machine code by the Just-In-Time (JIT) compiler.
In .NET there are three types of JIT (Just-In-Time) compilers
Learn other important components in .net framework development.