The document discusses modern web architecture using JavaScript, APIs and markup. It focuses on static site generators like Gatsby.js and how they can be used to build sites sourced from headless CMS APIs or large CMSs like WordPress and Drupal. The key benefits of a JAMstack architecture are also covered, such as performance, scalability, security and developer experience. Examples of sites built with Gatsby.js are shown and the speaker demonstrates building a simple site with Gatsby.js.