What is React.js?
ReactJS is a JavaScript library that was built with Facebook in 2013. It is an open-source library that was primarily built for client-side development. It is used to improve the UI and enhance the client user experience. ReactJS is most widely used because it is used to create single-page applications.
Difference between React.js and Bootstrap
React JS is a JavaScript library for creating user interfaces while Bootstrap is a framework having pre-designed and styled components to create responsive UI. React dynamically builds the structure and Bootstrap add the format and styling to the components.