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Node.js is an open-source, cross-platform JavaScript runtime environment that executes server-side code. It's designed for building scalable network applications and can handle many concurrent connections with low overhead. Node.js uses an event-driven, non-blocking I/O model which makes it lightweight and efficient, perfect for data-intensive real-time applications that run across distributed devices. The runtime is powered by the V8 engine from Google Chrome and has a rich library of various JavaScript modules that simplifies web application development.

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