v0 by Vercel is an AI interface generation tool that transforms natural language descriptions into production-ready React and Tailwind CSS component code. Developers and designers describe the UI they want — from simple buttons to complete dashboard layouts — and v0 generates clean, accessible, copy-paste-ready code that works immediately in any React project. It has become the fastest way to go from design concept to working frontend code, and serves as the default UI generation layer within Bolt.new and other AI coding platforms.