Next.js is an open-source React front-end development web framework that enables functionality such as server-side rendering and generating static websites for React-based web applications. Next.js is maintained by Vercel, formerly known as Zeit, and is widely used by developers and organizations to build fast, scalable, and SEO-friendly web applications. Next.js provides features such as file-based routing, API routes, automatic code splitting, static site generation, and dynamic data fetching, allowing developers to create dynamic and interactive user experiences with minimal configuration. Next.js is highly extensible and integrates seamlessly with popular front-end and back-end frameworks, libraries, and tools. It supports TypeScript, CSS-in-JS, and other modern web development techniques out of the box, enabling developers to focus on building features rather than managing infrastructure. Next.js is used by companies such as TikTok, Hulu, Ticketmaster, and Lyft to build high-performance web applications that engage and delight users.