Tailwind CSS is a popular CSS framework with a utility-first approach. The core provides flexible CSS classes with predefined CSS rules to build your own UI elements. For example, instead of an opinionated btn class as in Bootstrap, Tailwind offers primitive classes like bg-blue-500, rounded and p-4 to apply a button. A set of reusable classes can also be grouped as a Tailwind CSS component and there are even a couple of libraries that take this approach to build components for Tailwind.
Tailwind is an outstanding library, however it lacks a true comprehensive UI suite specifically when combined with Vue.js, this is where PrimeVue comes in by providing a wide range of highly accessible and feature rich UI component library. The core of PrimeVue does not depend on Tailwind CSS, instead we provide the necessary integration points such as the primeui tailwind plugin and the presets for the unstyled mode.