CPython is the official reference implementation of the Python programming language, written in the C programming language. It is the most widely used Python interpreter and serves as the foundation for the Python language’s development and evolution. CPython compiles Python code into bytecode, which it then interprets at runtime, enabling cross-platform compatibility and dynamic execution. Its architecture allows for integration with C libraries and extensions, making it highly extensible and versatile. While CPython is powerful and widely supported, it is subject to the Global Interpreter Lock (GIL), which can affect multi-threaded performance. Nevertheless, it remains the default and most popular Python interpreter in use today.