What is Design system?
A design system is a shared library of reusable UI components, tokens, and rules that keep a product visually consistent and faster to build. It is what stops every screen from reinventing buttons, spacing, and colour.
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Why it matters
Beyond a point, consistency cannot live in people heads. A design system encodes the decisions once so new screens compose from tested parts instead of drifting apart.
In practice
Tokens define the values (colour, spacing, type), components package them into reusable pieces, and documentation keeps everyone using the same vocabulary. It pays off as a product and team grow.