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Node.js is a free, open-source, and cross-platform JavaScript runtime environment that allows developers to run JavaScript code outside the browser, typically on a server. It enables you to build fast, scalable web applications, real-time services like chat apps, and tools that handle a large number of simultaneous requests efficiently. Node.js uses an event-driven, non-blocking I/O model, which makes it lightweight and efficient — perfect for data-intensive applications that need to run in real-time. It also comes with npm (Node Package Manager), providing access to thousands of libraries, making development easier and faster.