what does link do in react code example

Example 1: link to react

import React, { Component } from 'react';
import { render } from 'react-dom';
import { BrowserRouter, Route, Switch, Link } from 'react-router-dom';
import { Home } from 'wherever-you-put-it/home.component.jsx';
import { Something } from 'wherever-you-put-it/something.component.jsx';
import { SomethingElse } from 'wherever-you-put-it/something-else.component.jsx';

class App extends Component {
	render() {
      return (
      	<BrowserRouter>
        	<Switch>
        		<Route path="/">
        			<Home />
        		</Route>
        		<Route path="/something">
        			<Something />
        		</Route>
        		<Route path="/somethingelse">
        			<SomethingElse />
        		</Route>
        	</Switch>
        	<SomeComponentOrElement>
        		<Link to="/">Home</Link>
        		<Link to="/something">Something</Link>
        		<Link to="/somethingelse">Something Else</Link>
        	</SomeComponentOrElement>
        </BrowserRouter>
      )
    }
}

render(<App />, document.getElementById('app'));

Example 2: link tag react

<Link to={`/users/${user.id}`} activeClassName="active">{user.name}</Link>
// becomes one of these depending on your History and if the route is
// active
<a href="/users/123" class="active">Michael</a>
<a href="#/users/123">Michael</a>

// change the activeClassName
<Link to={`/users/${user.id}`} activeClassName="current">{user.name}</Link>

// change style when link is active
<Link to="/users" style={{color: 'white'}} activeStyle={{color: 'red'}}>Users</Link>