The Auto Class plugin allows users to automatically apply CSS classes to notes in Obsidian based on their file paths or tags. This makes it easy to customize the appearance of notes without manually editing YAML headers or adding CSS classes. Users can configure folder paths or tags to apply specific CSS classes to child notes or tagged files. For more advanced usage, glob matching can be enabled to create dynamic and flexible class assignments. The plugin supports the use of CSS snippets, enabling custom visual themes or layout changes for specific notes or folders. Once the rules are set, the plugin automatically applies the CSS classes whenever the view is updated, streamlining customization across an entire vault.