> ## Documentation Index > Fetch the complete documentation index at: https://mintlify.com/nuxt/nuxt/llms.txt > Use this file to discover all available pages before exploring further. # Views and Templates > Learn how to structure your application's user interface with app.vue, components, pages, and layouts in Nuxt. Nuxt provides several component layers to implement the user interface of your application. Understanding these layers is essential for building well-structured Nuxt applications. ## App Entry Point The `app.vue` file serves as the **entrypoint** of your Nuxt application. By default, Nuxt treats this file as the entry point and renders its content for every route. ```vue app/app.vue theme={null} ``` If you're familiar with Vue, you might wonder where `main.js` is (the file that normally creates a Vue app). Nuxt handles this behind the scenes for you. ## Components Most components are reusable pieces of the user interface, like buttons and menus. In Nuxt, you can create components in the `app/components/` directory, and they will be automatically available across your application without explicit imports. ```vue app/app.vue theme={null} ``` ```vue app/components/AppAlert.vue theme={null} ``` Components placed in the `app/components/` directory are automatically imported and available throughout your application, thanks to Nuxt's auto-import feature. ## Pages Pages represent views for each specific route pattern. Every file in the `app/pages/` directory represents a different route displaying its content. To use pages, create an `app/pages/index.vue` file and add the `` component to `app/app.vue` (or remove `app/app.vue` for the default entry). You can then create more pages by adding new files in the `app/pages/` directory. ```vue app/pages/index.vue theme={null} ``` ```vue app/pages/about.vue theme={null} ``` ## Layouts Layouts are wrappers around pages that contain a common user interface for several pages, such as headers and footers. Layouts are Vue files using `` components to display the page content. The `app/layouts/default.vue` file will be used by default. If you only have a single layout in your application, we recommend using `app/app.vue` with `` instead. ```vue app/app.vue theme={null} ``` ```vue app/layouts/default.vue theme={null} ``` ```vue app/pages/index.vue theme={null} ``` Custom layouts can be set as part of your page metadata, allowing different pages to use different layout structures. ## Extending the HTML Template If you only need to modify the ``, refer to the SEO and meta section of the documentation. You can have full control over the HTML template by adding a Nitro plugin that registers a hook. The callback function of the `render:html` hook allows you to mutate the HTML before it's sent to the client. ```ts server/plugins/extend-html.ts theme={null} export default defineNitroPlugin((nitroApp) => { nitroApp.hooks.hook('render:html', (html, { event }) => { // This will be an object representation of the html template. console.log(html) html.head.push(``) }) // You can also intercept the response here. nitroApp.hooks.hook('render:response', (response, { event }) => { console.log(response) }) }) ``` This approach gives you complete control over the HTML structure and allows you to inject custom content into the rendered page.