Next.js
React's most popular meta-framework — Vercel, 2016. SSR, SSG, ISR, edge rendering, file-based routing, server actions, all from one command.
App Router (Next 13+, 2022) introduced React Server Components as default. Layouts, Suspense streaming, parallel routes, intercepting routes — powerful but with a steep learning curve. Pages Router (legacy) remains for backwards compatibility.
Dominates SaaS frontends and content-heavy sites (TikTok, Hulu, Twitch, Notion). Competitors: Remix (shares ideas, more "use the platform"), Nuxt (the Vue version), SvelteKit, Astro. Vercel's heavy monetisation drives the Next path toward Vercel hosting.