The Relay plugin introduces true multiplayer capabilities to Obsidian, allowing users to collaborate in real-time with live cursors, seamless offline editing, and folder sharing. It leverages Conflict-Free Replicated Data Types (CRDTs) to track and sync changes efficiently, ensuring that all collaborators see consistent updates. Users can create and manage relays, invite others using share keys, and organize shared folders. The plugin supports markdown files and folders, offering features like conflict-free block editing and quick updates upon reconnecting. Relay prioritizes a local-first approach, enabling offline functionality and merging edits upon reconnection.