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Socket.IO is an open-source real-time application framework for JavaScript that enables bi-directional communication between web clients and servers. The framework operates on a transport called WebSocket, which provides asynchronous communication. It uses the EventEmitter pattern at its core, allowing multiple clients to connect to a server through simple APIs and broadcast messages to all connected users or specific groups of users. Socket.IO is event-driven and can handle different types of data structures natively, including JSON objects. The library is often used in conjunction with Node.js but also supports other platforms such as .NET or PHP through interop solutions like for client applications written in other languages.

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