The Marp plugin integrates Marp's presentation features into Obsidian, allowing users to create and preview slides directly from Markdown files. It supports exporting slides in various formats, including PDF, PPTX, and HTML, with the ability to embed images for seamless sharing. The plugin offers convenient features like auto-reloading previews and split-tab previewing, making it easy to refine presentations. Additionally, users can customize themes by specifying a theme folder location in the settings. Transitions are supported in HTML exports with specific browser configurations, enhancing presentation visuals.