What is Next.js and why use it?

Short answer: Next.js is a React framework that enables server-side rendering (SSR), static site generation (SSG), API routes, and more out-of-the-box.

Explain a bit more

It simplifies React app development by providing a set of conventions and features that improve performance, SEO, and developer experience. Why use Next.js? Server-Side Rendering (SSR): Automatically generates HTML on the server for better SEO and faster initial load. Static Site Generation (SSG): Pre-renders pages at build time, improving performance. Automatic Code Splitting: Only loads the necessary JavaScript for the current page. File-Based Routing: Routing is based on the file system, making navigation easier. API Routes: Allows you to build API endpoints directly inside your Next.js app. Image Optimization: Automatically optimizes images for better performance. Example: npx create-next-app my-next-app In this setup, the app can be SSR or SSG-enabled, providing better performance and SEO out of the box.

Real-world example (ShopNest)

ShopNest’s storefront is React: components for ProductCard, CartDrawer, and CheckoutForm, with hooks for local UI state.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.