Tailwind CSS is a utility‑first framework that lets developers compose layouts and styles using pre‑defined classes like flex, pt‑4, and rotate‑90 right in the markup. It targets web developers who want to prototype and ship sites quickly without writing custom CSS. What sets Tailwind apart is its focus on modern CSS features, dark‑mode support, and a purge system that removes unused styles, keeping production bundles under 10 kB. The framework also offers grid utilities, responsive breakpoints, and 3D transforms, making complex layouts easier to reason about.