Processing is a programming language and development environment designed for artists, designers, and other creators to easily create interactive visual and audio projects. It is based on Java and provides a graphical user interface for writing code, making it accessible for beginners and experts alike. Processing is often used in the fields of creative coding, data visualization, and interactive media art to create dynamic and engaging visual experiences. It allows users to easily manipulate graphics, animations, and sound, making it a versatile tool for creating interactive projects across various platforms.