What exactly is node.js? Is it a command-line tool, a language, the same thing as Ruby on Rails, a cure for cancer?
If you're new to web development, it can be a bit confusing as to what exactly node.js is and to what you should do with it, and there's a lot of information out there...most of which seems to be tailored towards genius-level developers.
So, here's a node.js introduction for those who have no idea what it is.
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