JAMstack is an architectural approach where the frontend is pre-built as static files (Markup), dynamic functionality is handled by JavaScript in the browser, and data is accessed through APIs. By decoupling the frontend from the backend and eliminating server-side rendering at runtime, JAMstack sites deliver superior speed, security, and scalability. Content delivery networks (CDNs) serve the static files globally, minimizing latency. JAMstack is a growing paradigm for performance-focused web projects.