Node.js is a JavaScript runtime environment that executes JavaScript code.

Node.js is a free, open-source, cross-platform JavaScript runtime environment that executes JavaScript code outside of a web browser. Built on Google Chrome's V8 JavaScript engine, it enables developers to use JavaScript to write server-side scripts and build scalable network applications. Key Features ​Event-Driven and Non-Blocking I/O: Node.js uses an asynchronous, single-threaded architecture that handles thousands of concurrent connections efficiently without waiting for operations (like database reads or file access) to finish before processing the next request. ​Single Language across Stack: Allows full-stack JavaScript development, meaning the same language can be used for both frontend client code and backend server logic. ​V8 Engine Power: Compiles JavaScript directly into native machine code, delivering fast performance and execution speeds. ​NPM (Node Package Manager): Comes bundled with NPM, providing access to hundreds of thousands of open-source packages and libraries.