Morning Keynote- Everything You Need to Know About Node.js Event Loop - Bert Belder, IBM If you're a Node.js programmer, you probably know that node has an event loop, just like a web browser. But there are many misconceptions about how it really works. Does Node use threads, or not? Where do callbacks come from? Is it better to use nextTick or setImmediate? Node's event loop is built on libuv, and libuv's author is here to tell you all a Node developer needs to know about the event loop.