O que é o roteador de navegação

<BrowserRouter basename="/calendar">
    <Link to="/today"/> // renders <a href="/calendar/today">
    <Link to="/tomorrow"/> // renders <a href="/calendar/tomorrow">
    ...
</BrowserRouter>
// A <Router> that uses the HTML5 history API (pushState, replaceState and the popstate event) to keep your UI in sync with the URL.
Arslank7