Storybook is a frontend workshop for building UI components and pages in isolation, allowing developers to compose sections and pages independently, test them independently, and ensure consistency. It's an open-source tool that thousands of teams use for UI development, testing, and documentation. Netlify uses Storybook to build reusable "components" and pages, and has implemented a strategy that includes automated visual regression testing (VRT) using Chromatic, which takes screenshots of stories and compares them to the expected results. This allows developers to test their components in isolation, while also ensuring consistency across the entire app. By using Storybook, Netlify's team can write stories for every component or page, regardless of how complex they are, and use a strategy that balances coverage with cost. The tool has become an integral part of Netlify's development process, empowering everyone to be involved in changes large and small.