React is a popular open-source front-end JavaScript library for building web and mobile UI components, known for its ease of use, flexibility, and high-performance capabilities. It's often combined with Next.js, another framework that provides additional features such as server-side rendering, routing, and code-splitting. React and Next.js are commonly used in JAMstack architectures, which emphasize the use of APIs, JavaScript, and markup to create dynamic web applications. A serverless database like Fauna can be integrated with React and Next.js to provide a secure data platform directly accessible from the browser, reducing financial and operational overhead and increasing developer agility.