The document discusses micro-frontend architecture, which divides the frontend UI into smaller, semi-independent applications. It covers the core ideas like technological independence and faster development. Integration approaches include server-side templates, build-time integration using packages, and runtime integration with iframes or JavaScript. Challenges include complexity, coordination, and performance, which can be overcome with standardization and DevOps practices. Popular companies using microfrontends are IKEA, Upwork, and Spotify.