Socket.IO is a real-time bidirectional communication library for web and mobile applications, enabling low-latency messaging between servers and clients across platforms. It provides reliable fallback options (such as HTTP long-polling) when WebSocket is unavailable, and supports scalable event-based communication for multi-server deployments. The project is primarily used for building real-time web applications, including chat, live updates, and collaborative tools, and is widely associated with the Node.js ecosystem. It is headquartered in the open-source community with documentation and resources available online.
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