v0 by Vercel is a generative AI tool that creates full-stack web applications and UI components from natural language descriptions. It generates production-ready code using React, Next.js, Tailwind CSS, and shadcn/ui, complete with responsive design, accessibility, and modern best practices. The iterative chat interface lets designers and developers refine outputs through conversation, bridging the gap between design intent and working code. v0 supports direct deployment to Vercel for instant publishing.