A collection of pre-defined guidelines and principles that help to create a consistent user experience. It establishes a standardized approach to visual design, user interface components, and interactions, which simplifies the design and development process. By ensuring consistency throughout the product or service, a design system can make it easier for users to understand and use. It also has the added benefit of saving time and resources, since it provides a library of reusable components that can be quickly incorporated into new designs.