The `pages/` directory is optional, meaning that if you only use [app.vue](/docs/directory-structure/app), `vue-router` won't be included, reducing your application's bundle size.
If you place anything within square brackets, it will be turned into a [dynamic route](https://next.router.vuejs.org/guide/essentials/dynamic-matching.html) parameter. You can mix and match multiple parameters and even non-dynamic text within a file name or directory.
If you need a catch-all route, you create it by using a file named like `[...slug].vue`. This will match _all_ routes under that path, and thus it doesn't support any non-dynamic text.
To navigate between pages of your app, you should use the `<NuxtLink>`component. This component is included with Nuxt and therefore you don't have to import it as you do with other components. It is similar to the HTML `<a>` tag except that instead of using a `href="/about"` you use `to="/about"`. If you've used `vue-router` before, you can think of `<NuxtLink>` as a replacement for `<RouterLink>`.
The `<NuxtLink>` component should be used for all internal links. That means for all links to the pages within your site you should use `<NuxtLink>`. The `<a>` tag should be used for all external links. That means if you have links to other websites you should use the `<a>` tag for those.
We provide a semantic alias for `RouterView`, the `<NuxtChild>` component, for displaying the children components of a [nested route](https://next.router.vuejs.org/guide/essentials/nested-routes.html).