JAMstack is a modern architectural pattern for building web applications that leverages JavaScript, APIs, and Markup to separate the frontend presentation layer from dynamic functionalities. This approach allows developers to serve pre-built markup and assets over a CDN for faster loading speeds while dynamically adding functionalities through JavaScript and APIs. Benefits of using JAMstack include improved performance, enhanced security due to the absence of a traditional backend or database, cost-effective scalability via CDN, and a better developer experience by allowing focus on specific application parts without backend setup. The tutorial illustrates building an e-commerce website using the Next.js framework, which supports server-side rendering and static web applications with features like automatic code splitting and dynamic routing. Additionally, the tutorial explains deploying applications using serverless platforms and APIs and highlights the ease of maintaining content through static files or content APIs. The guide concludes with steps on deploying the application to Netlify for live viewing and updating via GitHub integration.