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React-Router is the ability to move between different parts of an application when a user enters a URL or clicks an element (link, button, icon, image, etc) within the application. In single-page apps, there is only a single HTML page to render the different components based on the navigation of the page. To see the routes in action, we will edit the App.js and then create other components. We will then import the React router on our index.js.