A design system is a shared set of reusable components, styles and written rules that keeps a product or brand looking and behaving the same across every page and screen. It usually includes colors, type, spacing, buttons and forms, plus guidance on when and how to use each.
In short
It saves time, because designers and developers reuse parts instead of redrawing and rebuilding them, and it prevents drift, where each page ends up slightly different. A small business may need only a style sheet and a few components. A large product with many contributors gains the most.
Brand colors and type scale, spacing rules, buttons, forms, icons, page layouts, tone of voice and accessibility rules, kept in one place that designers and developers both use. It has to be maintained: a design system that no one updates falls out of use.
Our UI and UX design page covers how interfaces are designed.
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