A UI kit provides developers with a set of reusable components that can be easily integrated into a website or application. These components are pre-designed with consistent styling and functionality, allowing developers to save time and effort in the design and development process. UI kits can be either custom-built or third-party, and often include components for buttons, forms, typography, icons, and more.

React Native is a framework for building mobile applications using React and JavaScript. It enables developers to write once and deploy to multiple platforms, including iOS, Android, and the web, while providing a native app-like experience to users.