Jamstack is a frontend stack architecture that separates the frontend and backend into two distinct components, with markup pre-built into static assets served from a CDN and relying on reusable APIs for functionalities. This decoupling allows for better performance, scalability, security, cost-effectiveness, and developer productivity compared to traditional monolithic architectures. Jamstack sites can be built using static site generators or headless content management systems like Strapi, which provide pre-built templates, automated builds, and APIs for services. The architecture has several benefits, including reduced complexity, lower costs, and faster deployment, making it an attractive option for modern web development.