The Auto Hyperlink plugin enhances the note-taking experience in Obsidian by automatically converting specified words or phrases into hyperlinks in read mode. Users can define custom rules using JSON, where patterns (like specific words or regular expressions) are matched and linked to corresponding URLs. The plugin also supports placeholders for dynamic URL generation and multiple rule definitions, allowing for flexible hyperlink management. Additionally, it offers experimental features like mobile support and the ability to insert links into the editor view. This plugin simplifies the process of maintaining and linking relevant resources in notes without manually adding links, making it especially useful for large documents or repeated references.