Socket.io

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.