React.js: Frontend library for building UI components.
Next.js: Full-stack framework with frontend & backend capabilities.
React.js: Only supports Client-Side Rendering (CSR).
Next.js: Supports CSR, SSR (Server-Side Rendering), and SSG (Static Site Generation).
React.js: Relies on client-side JavaScript, which can slow down initial page load.
Next.js: Pre-renders pages, improving performance & SEO.
React.js: Poor SEO due to client-side rendering.
Next.js: Better SEO as it supports server-side rendering.
React.js: Uses React Router for navigation.
Next.js: Has built-in file-based routing.
React.js: Needs external tools (Express, Firebase) for backend.
Next.js: Has built-in API routes for backend.