React Router is a library that enables navigation in a React app without refreshing the page, transforming it into a multi-page-like experience.
React Router helps in setting up routes for different pages like Home, About, and Contact, making navigation smoother.
It involves installing React Router, creating page components like Home.jsx, About.jsx, and Contact.jsx, and using routes to switch views without page refresh.
React Router allows for dynamic routing, such as displaying a user profile based on ID, enhancing the app-building experience in React.