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In a React Router application, it is important to handle errors such as route not found errors. When a user navigates to a route that does not exist, you can display a custom error page to provide a better user experience.

One way to handle route not found errors is by defining a Route component without a path prop at the end of your Switch component. This component will act as a catch-all for any routes that do not match the defined paths.

By defining a catch-all Route component without a _ prop, you can handle route not found errors and display a custom error page.