Static Site Generation (SSG) is a build-time approach where all pages are pre-rendered as plain HTML files before deployment, rather than generated on each server request. The resulting files are served instantly from a CDN, giving excellent performance and very low [Time to First Byte (TTFB)](/glossary/time-to-first-byte). SSG is ideal for content that does not change per user — blogs, documentation, marketing sites — and is highly SEO-friendly because crawlers receive complete HTML with no JavaScript rendering required. The trade-off is that new content requires a rebuild and redeploy.