The ePub Reader plugin allows users to open and read .epub files directly within their Obsidian vault. By placing ePub books in any vault folder, users can click on the file to view and read the content in a dedicated ePub view. The plugin supports features like table of contents navigation for seamless browsing through chapters and sections, enhancing the reading experience within Obsidian. It integrates effortlessly into the workflow, making it convenient for users to manage and access eBooks alongside their notes and other files.