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What can we do with node.js, socket io or any server side JavaScript?

I know every programming language or framework has its own features or functionality that makes it different from other. For example, we use jQuery specially for nice UI design. On that view, what is necessity of learning node.js?

hexacyanide
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user727412
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    [Usages of node.js](http://stackoverflow.com/questions/5506690/usages-of-node-js-what-obstacles-is-it-aiming-to-provide-a-ramp-for/5506770#5506770) – Raynos Jun 12 '11 at 15:28
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    [Why and when to use node.js](http://stackoverflow.com/questions/5617683/why-and-when-to-use-node-js/5619188#5619188) – Raynos Jun 12 '11 at 15:29
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    [What is the point of node.js](http://stackoverflow.com/questions/6207384/what-is-the-point-of-node-js/6207461#6207461) – Raynos Jun 12 '11 at 15:30
  • What specifically do you want to know that isn't covered in those questions? – Raynos Jun 12 '11 at 15:32

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