Storybook Storybook is an open-source  UI development tool  that lets developers build, test, and document components in an isolated sandbox environment, separate from the main application, ensuring consistency and efficiency. Its basics involve creating "stories" (different states of a component), running the Storybook server (often  npm run storybook ), and using its interface to interactively adjust props, view different states (like error or loading), and leverage add-ons for testing (accessibility, visual regression) and documentation.   This video provides a quick overview of Storybook: 02:19 Fireship YouTube • 27 Jun 2022 Core Concepts: Isolation :  Develop components without app complexities (data, routing) in a clean environment. Stories :  Code snippets defining different UI states (e.g., a button in primary, secondary, disabled states) for a component. Sandbox :  The Storybook UI where components are rendered and interacted with. Add-ons :  Plugins that extend functionality, like controls for props, accessibility checks, or viewport resizing.   Basic Workflow: Install:  Add Storybook to your project ( npx sb init ). Create Stories:  In your component's  stories  folder,  export  your component and define stories (e.g.,  export const Primary = () =>