Jamstack is a modern web development architecture that enables you to create static websites and benefit from great performance, high traffic resistance, high security and great SEO.
Finally, markup is something that should be pre-built at deploy time. As an effect, Jamstack generates a static page available on the client side. It is great for improving both the user experience and the developers experience.
Together with a content management system (CMS) it makes a great marketing and digital business combination!