When vue-router is added to Vue as a plugin, it starts to watch for changes on window.location.pathname, and other URL properties, to check the weight of the current URL on the browser against the list of URLs on your router configurations.
In this particular case, we are using a direct URL and a non-dynamic URL. Because of that, the vue-router plugin only needs to check direct matches of the URL paths and doesn't need to weigh the possible matches against a regex validator.
After a URL is matched, the router-view component acts as a dynamic component and renders the component we defined on the vue-router configuration.
