Server-Side Rendering (SSR) is a web delivery method where HTML is generated on the server for each request and sent to the browser ready to display, rather than being built in the browser via JavaScript. Because Googlebot receives fully-formed HTML immediately, SSR is generally more SEO-friendly than client-side rendering, where content may take extra time to appear. SSR can increase [Time to First Byte (TTFB)](/glossary/time-to-first-byte) if server processing is slow, so caching and edge delivery are common companions.