Storybook is a tool for UI development. It makes development faster and easier by isolating components. This allows you to work on one component at a time. You can develop entire UIs without needing to start up a complex dev stack, force certain data into your database, or navigate around your application.
Storybook helps you document components for reuse and automatically visually test your components to prevent bugs. Extend Storybook with an ecosystem of addons that help you do things like fine-tune responsive layouts or verify accessibility.