What is event-driven architecture in Node.js?
A model where the system waits for events like a request arriving or a file read completing, and responds with callbacks. The event loop processes these events one at a time on a single thread, which is efficient for many concurrent I/O connections.
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More FAQs in Node.js Event-Driven Architecture Explained
Traditional servers like Java or PHP spawn a new thread per request, using more memory. Node.js uses a single thread with the event loop, processing callbacks as async operations complete, which uses less memory for many concurrent connections.
A built-in class that lets you create and listen for custom events. Many Node.js modules, like streams and HTTP servers, are built on events, so understanding EventEmitter is key to understanding Node.js internals.
Because the single thread is not blocked waiting for I/O. While one request waits for a database query, the event loop processes other requests' callbacks. This lets Node.js handle many concurrent connections with one thread.
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