Socket.io

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Socket.IO is one of the top trending JavaScript libraries of today, widely used for the development of performance-sensitive realtime web applications. The event-driven technology consists of two crucial components - the client-side and the Node.js back-end libraries. It is commonly used to develop binary streaming, real-time analytics, document collaboration and instant messaging systems. Socket.io is a choice of today’s hottest start-ups, including Trello, FlightCar and many others.