What is difference between JavaScript and NodeJS?

JavaScript is a lightweight, cross-platform, interpreted scripting programming language that is primarily used for client-side scripting. It’s built into both Java and HTML. On the other hand, Node. js is a server-side scripting language based on the Google Chrome V8 engine.

Node. js is a JavaScript runtime environment that achieves low latency and high throughput by taking a “non-blocking” approach to serving requests . In other words, Node. js wastes no time or resources on waiting for I/O requests to return.6 Nis 2020

Node is completely event-driven. Basically the server consists of one thread processing one event after another . A new request coming in is one kind of event. The server starts processing it and when there is a blocking IO operation, it does not wait until it completes and instead registers a callback function.24 Ara 2015