Next.js
In plain terms
A React framework for production with rendering and routing built in.
Going deeper
Next.js adds server-side rendering, static generation, file-based routing, and API routes to React for fast, SEO-friendly apps. It handles much of the production setup.
Under the hood
Supports SSR, SSG, ISR, and (in the App Router) server components; a leading full-stack React framework.
Examples
E-commerce, marketing sites, dashboards, full-stack React apps, Vercel hosting.
Think of it like...
Like React with the whole production crew, lighting, staging, distribution, already hired.