What is Server-Side Rendering (SSR)?
Generating HTML on the server for each request, so the page arrives fully rendered in the browser.
SSR means the server runs your React components, produces complete HTML, and sends it to the browser. The user sees content immediately (fast First Contentful Paint), and search engines can index the page without executing JavaScript. In Next.js, SSR is the default for dynamic pages. For static content, Static Site Generation (SSG) is preferred because it serves pre-built HTML from a CDN.