Generating the HTML of a page on the server for each request, so the browser receives a complete document instead of an empty shell that has to fetch and assemble content with JavaScript.
SSR gives a fast first impression and content that search engines and link previews can read reliably. For marketing sites, marketplaces, and anything that depends on organic traffic, it is effectively mandatory.
We build with Next.js and choose the rendering mode per page: server rendering for personalised or frequently changing pages, static generation for stable ones, and client rendering only inside interactive widgets.