The Custom Classes plugin enhances Obsidian's functionality by allowing users to add custom HTML classes directly to Markdown blocks. This enables greater control over the styling and presentation of elements like lists, tables, headings, and more, all while maintaining compatibility with Obsidian's Live Preview mode. The plugin is designed for seamless integration, providing shorthand options and supporting multiple classes for advanced use cases. It is particularly useful for users looking to customize their notes visually without breaking Markdown formatting or relying on embedded HTML.