What is “main” in “ int main”

Question

Is “main’’ compulsory? Can I use any other words instead of it?

Answer 1

no, you cant, its a standard required function in cpp

Answer 2

Within standard C++ a main function is required, Outside of standard C++ you can for example write a Windows specific program and use one of Microsoft's custom startup functions (wMain, winMain, wWinmain). In Windows you can also write the program as a DLL and use rundll32 to run it.
you can't execute any program without main() but you can hide main() function and execute any program for program go through this link it will help you to understand well
https://stackoverflow.com/questions/7050925/is-it-possible-to-write-a-program-without-using-main-function