Which popular React framework is primarily used for Server-Side Rendering?

Next.js is a popular React framework primarily used for Server-Side Rendering (SSR). It simplifies the process of building SSR-enabled React applications, providing features like automatic code splitting and routing. While Redux is a state management library for React, Angular is a different framework, and Vue.js is another JavaScript framework, they are not primarily used for SSR in the same way Next.js is.