What is Exactly? - a beginners introduction to Nodejs

What exactly is ? 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 is and to what you should do with it, and there’s a lot of information out of which seems to be tailored towards genius-level developers. So, here’s a introduction for those who have no idea what it is. We’re going to cover the difference between javascript in a browser vs javascript