In this blog post, Ekaansh Arora explains how to use the Agora Web UIKit with a Next.js web app. The author discusses the "window is not defined" error that occurs when using server-side rendering (SSR) or static-site generation (SSG) and provides a solution by using dynamic import with no SSR. The example project demonstrates how to add video calling capabilities to a Next.js web app using Agora Web UIKit, and the author also mentions other available UIKits for Android, iOS, React Native, and Flutter.