Design system  A Design System is a set of interconnected patterns and shared practices coherently organized to aid in digital product design and development of products such as apps or websites. It may contain, but is not limited to, pattern libraries and design language, style guides, coded components, brand language and documentation for use of these. It serves as a reference or source of truth that helps the different teams involved (such as designers, developers, copywriters and project managers) to design and build digital products. Some of the advantages of a design system are:   Notable design systems include Lightning Design System (by Salesforce) and Carbon Design System (by IBM).