where to use switch react router code example

Example 1: react router switch

ReactDOM.render((
       <Switch>
         <Route exact path="/" component={Home} />
         <Route path="/login" component={Login} />
         <Route path="/explore" component={Explore} />
       </Switch>),
       document.getElementById('root')
   );

Example 2: how to export switch from react-router-dom

let routes = (
  <Fade>
    <Switch>
      {/* there will only ever be one child here */}
      <Route />
      <Route />
    </Switch>
  </Fade>
);

let routes = (
  <Fade>
    {/* there will always be two children here,
        one might render null though, making transitions
        a bit more cumbersome to work out */}
    <Route />
    <Route />
  </Fade>
);