Node.js is an event-driven JavaScript runtime built on Chrome's V8 JavaScript engine. It uses an event loop model that handles asynchronous I/O efficiently by allowing non-blocking operations like networking to finish in the background while the main thread continues to run. This allows Node.js to respond quickly even under high loads with thousands of simultaneous connections without blocking. Common uses of Node.js include real-time web applications, cloud services, JavaScript development tools and build systems.
Related topics: