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As an asynchronous event driven framework, Node.js is designed to build
scalable network applications. In the following "hello world" example, many
connections can be handled concurrently. Upon each connection the callback is
fired, but if there is no work to be done Node is sleeping. </div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjWSuCsjAo4yaIkAiPe45sVNrka2X_huyn6TKbr5VA1dJpEPbqqK4o0jCtMU7nbqXbXeKSq7bIzh4-iHCvPJOYbQYgW4LBidzwyhtJPbwOM7MVRlBbnmyt5sH7hNAhaNB5unCEBxQ2w1LM/s1600/nodejs-wallpaper-nsfw_(1).jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="400" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjWSuCsjAo4yaIkAiPe45sVNrka2X_huyn6TKbr5VA1dJpEPbqqK4o0jCtMU7nbqXbXeKSq7bIzh4-iHCvPJOYbQYgW4LBidzwyhtJPbwOM7MVRlBbnmyt5sH7hNAhaNB5unCEBxQ2w1LM/s640/nodejs-wallpaper-nsfw_(1).jpg" width="640" /></a></div>
<h1>
About</h1>
<b>Node.js</b> is an <a href="http://en.wikipedia.org/wiki/Open_source" title="Open source">open source</a>, <a href="http://en.wikipedia.org/wiki/Cross-platform" title="Cross-platform">cross-platform</a> <a href="http://en.wikipedia.org/wiki/Runtime_system" title="Runtime system">runtime environment</a> for server-side and networking applications. Node.js applications are written in <a href="http://en.wikipedia.org/wiki/JavaScript" title="JavaScript">JavaScript</a>, and can be run within the Node.js runtime on <a href="http://en.wikipedia.org/wiki/OS_X" title="OS X">OS X</a>, <a href="http://en.wikipedia.org/wiki/Microsoft_Windows" title="Microsoft Windows">Microsoft Windows</a>, <a href="http://en.wikipedia.org/wiki/Linux" title="Linux">Linux</a>, <a href="http://en.wikipedia.org/wiki/FreeBSD" title="FreeBSD">FreeBSD</a>, <a href="http://en.wikipedia.org/wiki/NonStop" title="NonStop">NonStop</a> and <a href="http://en.wikipedia.org/wiki/IBM_i" title="IBM i">IBM i</a>.<br />
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Node.js provides an <a href="http://en.wikipedia.org/wiki/Event-driven_architecture" title="Event-driven architecture">event-driven architecture</a> and a <a class="mw-redirect" href="http://en.wikipedia.org/wiki/Non-blocking_I/O" title="Non-blocking I/O">non-blocking I/O</a> API that optimizes an application's throughput and scalability. These technologies are commonly used for <a href="http://en.wikipedia.org/wiki/Real-time_web" title="Real-time web">real-time web</a> applications.<br />
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Node.js uses the <a href="http://en.wikipedia.org/wiki/V8_%28JavaScript_engine%29" title="V8 (JavaScript engine)">Google V8</a>
 JavaScript engine to execute code, and a large percentage of the basic 
modules are written in JavaScript. Node.js contains a built-in library 
to allow applications to act as a Web server without software such as <a href="http://en.wikipedia.org/wiki/Apache_HTTP_Server" title="Apache HTTP Server">Apache HTTP Server</a> or <a href="http://en.wikipedia.org/wiki/Internet_Information_Services" title="Internet Information Services">IIS</a>.<br />
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<span style="font-size: x-small;"><i>Culled From <a href="http://en.wikipedia.org/wiki/Node.js" target="_blank">Wikipedia</a></i></span></div>
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Node is similar in design to and influenced by systems like Ruby's <a href="http://rubyeventmachine.com/">Event
Machine</a> or Python's
<a href="http://twistedmatrix.com/">Twisted</a>. Node takes the event model a bit further,
it presents the event loop as a language construct instead of as a library. In
other systems there is always a blocking call to start the event-loop.
Typically one defines behavior through callbacks at the beginning of a script
and at the end starts a server through a blocking call like
<code>EventMachine::run()</code>. In Node there is no such start-the-event-loop call. Node
simply enters the event loop after executing the input script. Node exits the
event loop when there are no more callbacks to perform. This behavior is like
browser JavaScript -— the event loop is hidden from the user. </div>
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HTTP is a first class citizen in Node, designed with streaming and low latency
in mind. This makes Node well suited for the foundation of web library or
framework. </div>
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Just because Node is designed without threads, doesn't mean you cannot take
advantage of multiple cores in your environment. You can spawn child processes
that are easy to communicate with by using our
<a href="http://nodejs.org/api/child_process.html#child_process.fork">child_process.fork()</a>
API. Built upon that same interface is the
<a href="http://nodejs.org/api/cluster.html">cluster</a> module, which allows you to share
sockets between processes to enable load balancing over your cores.</div>
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<span style="font-size: x-small;"><i>Culled From </i></span><a href="https://nodejs.org/" target="_blank"><span style="font-size: x-small;"><i>Node.js</i></span> </a></div>
<h1>
Downloads</h1>
Download the Node.js source code or a pre-built installer for your platform, and start developing today. Click <a href="https://nodejs.org/download/" target="_blank">HERE</a> to <a href="https://nodejs.org/download/" target="_blank">Download NodeJ.S</a><br />
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As an asynchronous event driven framework, Node.js is designed to build scalable network applications. In the following "hello world" example, many connections can be handled concurrently. Upon each connection the callback is fired, but if there is …

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