What is a design system and why is it valuable for UID?

• A. A catalog of fonts only.
• B. A collection of reusable components, patterns, and standards that underpins consistency, scalability, and efficiency across products.
• C. A project management approach.
• D. A set of marketing templates.

Answer: (B)

A design system is a centralized collection of reusable UI building blocks, interaction patterns, and the standards that govern their use. It goes beyond single screens by documenting how components look and behave—colors, typography, spacing, component states, accessibility requirements, and the artifacts designers and developers share (like tokens, a component library, and guidelines). For UID, this matters because it creates a consistent, predictable experience across all products, so users recognize the brand and interact in the same way everywhere. It also speeds work: designers assemble new screens from proven components, while developers implement them from the same definitions, reducing duplication and handoff friction. Updates—such as a color change or a refined button—can be applied once and propagate across the product suite, aiding scalability and maintenance. In short, a design system provides a cohesive framework that aligns design and development for quality, efficiency, and consistency across platforms.