Can you explain Node.js networking?

Node.js is built on the V8 engine and uses an event‑driven, non‑blocking I/O model. Networking is handled through the built‑in net module for raw TCP/UDP sockets and the http/https modules for higher‑level HTTP servers and clients. When you create a server with net.createServer(), Node registers a callback for the connection event; each socket is an instance of net.Socket, which emits events like data, end, and error. The event loop, powered by libuv, monitors file descriptors and dispatches callbacks when I/O completes, allowing thousands of concurrent connections without thread overhead. For HTTP, the http module parses request headers, streams bodies, and writes responses, all asynchronously. Node also offers the cluster module to fork worker processes, each with its own event loop, enabling multi‑core scaling. For advanced networking, you can use the tls module for secure sockets, dgram for UDP, or third‑party libraries like socket.io for real‑time communication. Understanding the event loop, back‑pressure, and stream pipelines is key to building efficient Node networking applications.