Node JS Is single threaded asynchronous non-blocking javascript runtime, but its not always single threaded there are occasions where nodejs uses multi-threading, so the questions we will try to answer in this video, when is nodejs single threaded and when does it use multi-threading and how will that affect my app? * Event main Loop 0:00 single thread, that really just loops for callbacks * Threading in Node jS (libuv) 4:00 * used for * IO/intensive * DNS queries * file system reads * CPU intensive * crypto * compression * process.env.UV_THREADPOOL_SIZE=1 Examples 8:00 Cluster Nodejs 16:00 Example 1 Http server return 1 Http server while 1 Http server with file system read async Http server with file system read sync Http server with fetch call to server (dns) Resources https://nodejs.org/en/docs/guides/dont-block-the-event-loop/ http://docs.libuv.org/en/v1.x/index.html 🎙️Listen to the Backend Engineering Podcast https://husseinnasser.com/podcast 🏭 Backend Engineering Videos https://backend.husseinnasser.com/ 💾 Database Engineering Videos    • Database Engineering   🏰 Load Balancing and Proxies Videos    • Proxies   🏛️ Software Archtiecture Videos    • Software Architecture   📩 Messaging Systems    • Message Queues & PubSub Systems   Become a Member null Support me on PayPal https://bit.ly/33ENps4 Stay Awesome, Hussein