> For the complete documentation index, see [llms.txt](https://docs.cremawork.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.cremawork.com/v-4-nextjs/overview/folder-structure/app.md).
# app
The App Router works in a new directory named `app`. The `app` directory works alongside the `pages` directory to allow for incremental adoption. This allows you to opt some routes of your application into the new behavior while keeping other routes in the `pages` directory for the previous behavior. If your application uses the `pages` directory, please also see the [Pages Router](https://nextjs.org/docs/pages/building-your-application/routing) documentation.
