What is JavaScript

What is JavaScript?
JavaScript, often abbreviated as JS, is a scripting language that is one of the core technologies of the world wide web (WWW) alongside HTML and CSS. It enables you to create dynamically updating content, control multimedia, animate images etc. Over 93% of websites use JavaScript on the client side for web page behavior often incorporating third-party libraries. All major web browsers have a dedicated JavaScript engine to execute the code on user’s devices.
JavaScript is a high-level, often just-in-time compiled language that conforms to the ECMAScript standard. It has dynamic typing, prototype-based object-orientation and first-class functions. It is a multi-paradigm, supporting event-driven, functional and imperative programming styles. It has application programming interfaces (APIs) for working with text, dates, regular expressions, standard data structures and the Document Object Model (DOM). 
In the ECMAScript standard, things like input/output (I/O), such as networking, storage or graphics facilities are not included, but web browsers or other runtime systems provide JavaScript APIs for I/O.
Originally, JavaScript was used only in web browsers, but are now core components of some servers and a variety of applications with nodejs as the most popular runtime system.
PS: The common error people make is the fact that Java having a similar name as JavaScript insinuates that they are both of them, well, they aren’t.

The usefulness of JavaScript, has since exceeded just being used for websites, as Mobile hybrid applications(e.g React Native), Data Science(e.g tensorflow.js), backend applications (server side, e.g nodejs) etc can all be built using JavaScript.
In summary, any language that does not grow or evolve tends to die off with time, and JavaScript has proved that it can achieve lots more. I won't be surprised if the next generation will hack NASA with just JavaScript.
Sources: MDNWikipedia

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