The document discusses creating a mobile interface for a library using Linktree. It explains what a bio link is and how bio links work by allowing users to add a single link to their social media profiles that leads to a customized landing page with links to various destinations. Linktree is highlighted as a popular bio link tool that allows users to easily create, customize, and share a page of important links. The benefits of using a bio link tool like Linktree to create a mobile interface for a library are discussed, including providing easy access to library resources on users' mobile devices. Steps for creating and customizing a Linktree account and page are outlined.