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copied!<p><a href="http://en.wikipedia.org/wiki/V8_%28JavaScript_engine%29" rel="nofollow noreferrer">V8</a> is an implementation of JavaScript. It lets you run standalone JavaScript applications (among other things).</p> <p>Node.js is simply a library written for V8 which does evented I/O. This concept is a bit trickier to explain, and I'm sure someone will answer with a better explanation than I... The gist is that rather than doing some input or output and waiting for it to happen, you just <em>don't</em> wait for it to finish. So for example, ask for the last edited time of a file:</p> <pre><code>// Pseudo code stat( 'somefile' ) </code></pre> <p>That might take a couple of milliseconds, or it might take seconds. With evented <a href="http://en.wikipedia.org/wiki/Input/output" rel="nofollow noreferrer">I/O</a> you simply fire off the request and instead of waiting around you attach a callback that gets run when the request finishes:</p> <pre><code>// Pseudo code stat( 'somefile', function( result ) { // Use the result here } ); // ...more code here </code></pre> <p>This makes it a lot like JavaScript code in the browser (for example, with <a href="http://en.wikipedia.org/wiki/Ajax_%28programming%29" rel="nofollow noreferrer">Ajax</a> style functionality).</p> <p>For more information, you should check out the article <em><a href="http://simonwillison.net/2009/Nov/23/node/" rel="nofollow noreferrer">Node.js is genuinely exciting</a></em> which was my introduction to the library/platform... I found it quite good.</p>

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