If you want to explore the web and see how interactions work on websites and web applications, you MUST learn JavaScript. This JavaScript tutorial explains everything in detail.
Hence, JS can be used to add interactivity to the front-end of the web-apps and create servers to run back-end using Node.Js. It is used to write JavaScript for back-end. If we want to write JavaScript away from browsers, we need Node.js, which is the run-time environment for JavaScript. Whenever we write JavaScript, the browser will execute that code for us. So, whenever you try to submit an empty form and an error message pops up, you should know that it's JavaScript behind that!
It has the power to add interactivity to static websites(built using HTML and CSS), apply dynamic styles, add or delete HTML elements dynamically, and much more.
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