Shadcn-ui is a set of reusable React components that prioritize accessibility, customization, and developer control. It allows developers to own the code directly, reducing external dependencies and version lock-ins, by utilizing a library called Radix which handles core accessibility requirements such as keyboard navigation, ARIA attributes, and screen-reader compatibility. With shadcn-ui, developers can customize their components using Tailwind CSS, remove or refactor any component with ease, and integrate new styling tokens without rigid design constraints. The framework provides two main installation options: a CLI-based workflow and copy-paste, allowing developers to choose the approach that suits their project best. Additionally, shadcn-ui integrates well with Vercel's v0 platform, which offers generative AI-driven scaffolding for rapid prototyping and customization of Next.js applications.