Notes:
Prototype : a line that promises to a compiler that a certain function exists somewhere in the server or harddisk or files so it doesn't throw an error. In C, it is done with copying the declaration line of a function and adding a semicolon at the end of it.
When we download / setup a specific programming language we download:
the specific version of the language's compiler for your operating system and CPU
the version of machine code of standard functions that the creator of the language has written that is fine tuned for our operating system and CPU
