Pygame is an open-source library for making multimedia applications like games built on top of the Python programming language. It provides functionalities for creating visually rich applications and is particularly suited for 2D game development. Pygame includes support for graphics, sound, event handling, and input device integration, offering a framework for rapid game development. It's known for its simplicity and ease of use, making it a popular choice for beginners in game development, as well as for prototyping and building small to medium-sized games. Pygame's community is active and provides a wealth of tutorials and resources for learning and development.