What Is Next.js & Why Use It
React is a library for building user interfaces — it gives you components, state, and a way to describe what the screen should look like. What it deliberately does not give you is routing, server rendering, bundling, or a build pipeline. For any real application you need all of those things, so a plain React project usually ends up assembling several separate tools: a router, a bundler, a data fetching library, an SSR setup, an image optimization pipeline — each configured and wired together by hand.
Next.js exists to remove that assembly work. It is an opinionated, batteries-included framework built on top of React that bundles routing, rendering, and tooling decisions into one coherent package, so you can start writing features on day one instead of configuring infrastructure.
The problems Next.js solves
No built-in routing in React — React alone has no concept of URLs; you would normally add a routing library and configure every route by hand.
No server rendering in React — a plain React app ships as an empty HTML shell that renders in the browser; getting content into the initial HTML requires a separate SSR setup.
No data fetching conventions — React does not prescribe how or where to fetch data, leading to ad-hoc patterns that differ from project to project.
No built-in optimizations — images, fonts, and scripts have to be optimized manually, or with yet more third-party tooling.
No backend story — a pure front-end React app has nowhere to put server-only logic like handling a form submission or talking to a database securely.
Key features at a glance
Feature | What it gives you |
|---|---|
App Router | File-and-folder based routing under |
Server Components | Components render on the server by default — smaller client bundles, direct access to backend resources. |
Image & font optimization |
|
API / Route Handlers | Write backend endpoints inside the same project, colocated with the pages that call them. |
Zero-config TypeScript | Add a |
Why it has become the dominant React framework
Next.js is built and maintained by Vercel, with heavy involvement from the React core team itself — several React features (like Server Components) were designed and shipped in close collaboration with the Next.js team. It powers a large share of production React sites in the wild, from small marketing pages to large e-commerce and SaaS platforms, precisely because it turns dozens of infrastructure decisions into sensible defaults you can override only when you need to.