Fresh is a modern web framework for the Deno runtime that prioritizes server-side rendering and islands architecture. Unlike Single Page Applications (SPAs) where the entire app ships as JavaScript to the browser, Fresh renders most content as HTML on the server and keeps only interactive components (islands) as Preact components that hydrate on the client. Routes are defined as files in the routes/ folder (file-system routing). Middleware, handlers, and Preact islands live in the same project. Deployment is simple: push code to Deno Deploy or run the Deno server on your VPS. No build step needed in many cases.