@maphew it's not really a standalone binary written in C ready to execute so much as it allows you to write python modules that compile down to C for performance without having to actually write C such as in this documentation.
https://docs.python.org/3/extending/extending.html
This is common practice for when you have a specific hotspot in your python code that needs to be performant beyond what the CPython interpreter offers. You get all the convenience of python but performance of C when needed.