**Shelfmark** is the media request portal for digital books and spoken media across **The Nest**. Whether you are looking for an e-book to read on your e-reader or an audiobook to listen to on the go, Shelfmark lets you browse catalog titles and submit requests for automated library delivery.
* **E-Books:** Ingested directly into your **[Calibre-Web](../media-and-entertainment/calibre-web.md)** library for web reading or e-reader syncing.
* **Audiobooks:** Ingested directly into your **[Audiobookshelf](../media-and-entertainment/audiobookshelf.md)** library for mobile listening and progress tracking.
* **Check Existing Libraries First:** Shelfmark does not automatically index items already stored on The Nest. Please search [Calibre-Web](../media-and-entertainment/calibre-web.md) or [Audiobookshelf](../media-and-entertainment/audiobookshelf.md) first to ensure the title isn't already available before submitting a new request.
* **Select the Right Search Mode:** Shelfmark features three distinct search modes:
* **E-Book Mode:** Filters results specifically for readable digital books.
* **Audiobook Mode:** Filters results specifically for spoken audio recordings.
* **Universal Mode:** Searches for both e-books and audiobooks simultaneously.