What is plugin type RuntimeNoCommandlet, EditorNoCommandlet, and Program?

Documentation does not explain about below plugin type, can anyone knows about these types?
RuntimeNoCommandlet, EditorNoCommandlet, and Program

Have you had an answer yet?

A commandlet in UE4 is a way of running code from the command line, see the documentation here UCommandlet | Unreal Engine Documentation

As the name suggests, the module won’t be loaded for commandlets with *NoCommandlet.