&gt; The concurrency model in Node is essentially the reactor pattern. While there are lots of concurrency patterns that you should learn, reactor pattern is also one of them.<p>A usable reactor pattern requires green threads (or threads) . Node.js does classic IO multiplexing (i.e. what has been available in C since the introduction of select()). It&#x27;s not bad, but don&#x27;t delude yourself into believing node.js does anything new.