…is limitation, it is useful to create an <App> component that renders the rest of your application. Separating your application from the router is also useful for server rendering because you can re-use the <App> on the server while switching the router to a <MemoryRouter>.
…ture: either a resolved value, or a reason that it’s not resolved (e.g., a network error occurred). A promise may be in one of 3 possible states: fulfilled, rejected, or pending. Promise users can attach callbacks to handle the fulfilled value or the reason for rejection.