Node.js is a runtime javascript, well node.js uses V8, and V8 simply is the name of a javascript engine built by google that runs javascript in the browser.
V8 is the simply named, the creator gave their engine and what does the engine mean. It means that the engine takes javascript code and compiles it to machine code, V8 itself is written in C++
What Node.js does ?
It allows you to run javascript on your computer and it adds useful functionalities to the javascript engine so that you can do more stuff there (like file handling etc). with the help of node.js, you can build web app, RESTful API, Chat app, and more
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