so it compiles c++ to webassembly syntax using empscripten compiler. what js has to do with webassembly? Is the idea is same with js? i.e. compiler js code to w

so it compiles c++ to webassembly syntax using empscripten compiler. what js has to do with webassembly? Is the idea is same with js? i.e. compiler js code to webassembly. noob here on web assembly.