?What is JavaScript

JavaScript is a scripting or programming language that allows you to implement complex features on web pages — every time a web page does more than just sit there and display static information for you to look at — displaying timely content updates, interactive maps, animated 2D/3D graphics, scrolling video jukeboxes, etc. — you can bet that JavaScript is probably involved.

JavaScript

Why is it called JavaScript?
When JavaScript was created, it initially had another name: “LiveScript”. But Java was very popular at that time, so it was decided that positioning a new language as a “younger brother” of Java would help.
But as it evolved, JavaScript became a fully independent language with its own specification called ECMAScript, and now it has no relation to Java at all.
Today, JavaScript can execute not only in the browser, but also on the server, or actually on any device that has a special program called the JavaScript engine.

JavaScript

What Is JavaScript Used For?
We covered this a bit in the intro, but here’s a quick list of the main things JavaScript is used for.
Adding interactivity to websites—yup, if you want a website to be more than a static page of text, you’ll need to do some JavaScripting
Developing mobile applications—JavaScript isn’t just for websites…it’s used to create those apps you have on your phone and tablet as well
Creating web browser-based games—Ever played a game directly from your web browser? JavaScript probably helped make that happen
Back-end web development—yeah, JavaScript is MOSTLY used on the front end of things, but it’s a versatile enough scripting language to be used on back end infrastructure, too.

JavaScript

What makes JavaScript unique?
There are at least three great things about JavaScript:
Full integration with HTML/CSS.
Simple things are done simply.
Support by all major browsers and enabled by default.
JavaScript is the only browser technology that combines these three things.
That’s what makes JavaScript unique. That’s why it’s the most widespread tool for creating browser interfaces. That said, JavaScript also allows creating servers, mobile applications, etc.

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