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An open-source, cross-platform runtime environment for JavaScript called Node.js enables programmers to execute JavaScript on the server side. It was developed by Ryan Dahl in 2009 and has since become widely adopted by developers to build scalable, fast, and efficient web applications. Node.js uses an event-driven, non-blocking I/O model, which means that it can handle multiple requests simultaneously without blocking the execution of other requests. This makes it ideal for building real-time applications like chat or online games.