The Next.js conference registration page is an immersive and interactive experience created using WebGL and React. The page features a 3D beam of light that bounces off objects, a prism, and a rainbow, all rendered in real-time within a web browser. To achieve this, developers used open-source tooling such as react-three-fiber, drei, and @react-three/postprocessing, which provide a set of convenient helpers for working with WebGL in React components. The page also includes adaptive performance monitoring using the PerformanceMonitor component from @react-three/drei to ensure smooth rendering on various devices. By leveraging WebGL and React, developers can create complex 3D graphics within a web browser, unlocking new possibilities for interactive and engaging experiences.