What is Node.js?

Node.js is a JavaScript runtime built on Chrome's V8 JavaScript engine. It allows developers to execute JavaScript code on the server side, enabling the creation of scalable and high-performance web applications. Node.js uses an event-driven, non-blocking I/O model, which makes it efficient and suitable for handling multiple connections simultaneously. It also has a rich ecosystem of libraries and tools available through npm (Node Package Manager), making it easier to develop applications.