What is cpy?

I think when people say 'cpy', they mean CPython.

CPython is the 'official' Python. It is the one most people use. When you go to the python.org website and download Python, you get CPython. It is the standard version.

It has the 'C' in the name because it is written in the C programming language. This C code is like the engine. It takes your Python code that you write, like print('Hello'), and it makes the computer understand it. It interprets your code.

It is good to know this because there are other types of Python. There is Jython, which runs on Java. There is also IronPython, which works with .NET. They are different 'engines' for the Python language.

But for almost everyone, especially beginners, CPython is the only one you need. All the tutorials and books you find will use CPython. So if you are just starting, you can be sure you are using the correct one. You do not need to worry about the others for now. I hope this is clear for you.