Headless UI is a component library created by the same team behind Tailwind CSS. As the name suggests, Headless UI is "headless", meaning that the components provided by the library does not ship with any styling, making it up to the developer in charge to style the components to their liking. Instead, Headless UI provides primitive and composable components which have been designed to be accessible and easily reusable. This makes Headless UI an ideal choice for building custom design systems which can be used throughout one or more projects.