Node.js is a JavaScript runtime environment that allows developers to write server-side code using JavaScript. Itu2019s widely used for backend development because it is fast, scalable, and event-driven, making it ideal for building web servers, REST APIs, and real-time applications. With Node.js, developers can use a single language (JavaScript) for both frontend and backend, simplifying full-stack development. Popular frameworks like Express.js enhance Node.js capabilities, enabling rapid application development. Many companies, including Netflix, PayPal, and LinkedIn, rely on Node.js for their