The Auto Journal plugin enhances Obsidian's Daily Notes by automatically backfilling missing notes for past days, months, or years. It supports custom date formatting for organizing notes by year, month, and day, making it ideal for journaling and long-term note management. The plugin includes features like templating with dynamic date tokens, navigation buttons for quick access to daily and monthly notes, and compatibility with other Obsidian plugins like Templater and Reminder. It also provides seamless integration for automatic backfilling of notes, ensuring a complete journal archive.