Navigation is the way users move between different screens or components within an app. In React (web development), navigation is usually managed with a library called React Router. This library uses the browser’s history to update the URL and display the right components based on the current route. React Router includes components like <BrowserRouter>, <Routes>, and <Route>. The <BrowserRouter> wraps your app and enables routing. Inside it, <Routes> looks for the first matching route, and <Route> defines which component should appear for a specific path. In React Native (mobile apps), navigation works differently because mobile apps don’t have URLs. Here, libraries like React Navigation are used to switch between screens smoothly, offering stacks, tabs, and drawer navigators. Both React Router and React Navigation provide flexible ways to control how users move through your app, ensuring a smooth experience whether on web or mobile.