What is output of emcmake and emmake (emscripten) on C/C++ project? What is the relation between emcc with emcmake and emmake?

Question

1- I run emcmake (emscripten) on the directory of CMakeList.txt file. what is the expected output? 2- Then, I run emmake (emscripten) on the directory of Makefile file. what is the expected output? 3- What is the relation between these command with emcc?

I try to compile c/c++ projects to webassembly.