Node.js is a JavaScript runtime environment based on Chrome’s V8 JavaScript engine. It is open source and server side. It is free and based on the concept of asynchronous programming. Its single-threaded, deadlock-free and asynchronous nature makes memory efficient.
Node.js itself is not JavaScript. Node is a program for executing JavaScript, but it is not JavaScript itself. In fact, Node is a C program. But Node is not written in JavaScript; is written in C, a language perfectly capable of doing the grunt work and heavy lifting required for networking. JavaScript is perfectly capable of sending instructions to a C program that can be executed in the dungeons of your operating system.
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