Progressive enhancement is a crucial concept in web development, especially when creating static sites using the Jamstack. Traditional server-side rendering can be challenging to implement with the Jamstack's focus on serving static files from a CDN and leveraging serverless functions. However, 11ty's new Serverless package and Netlify functions provide a solution that enables developers to progressively enhance their site's experience without having to rewrite their rendering code for both frontend and server. By utilizing libraries like InstantSearch.js, developers can quickly start from the server and create dynamic content using serverless functions, allowing them to overcome traditional front-end JavaScript limitations and providing a more seamless user experience.