A design system is a set of reusable design components, standards, and guidelines that enable a consistent and cohesive user experience across a product or product line. It helps product teams create and maintain a coherent visual and interactive style, and streamline the design and development process by providing a shared language and set of tools for designers and developers to use. In the context of creating great user experiences, a design system can help product teams create products that are efficient, scalable, and easy to use, and that provide a cohesive and consistent experience for users across different platforms and devices.