What is JavaScript?

Asked 19-Jul-2021
Updated 01-Jun-2023
Viewed 607 times

3 Answers


JavaScript is a high-level, interpreted programming language primarily used for adding interactivity and dynamic behavior to web pages. It is a versatile language that can be run on the client-side (in the web browser) as well as on the server-side (with the help of frameworks like Node.js).


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We can say that JavaScript is not a core programming language but it is a scripting language. It is mainly used in browsers and can only be used with HTML or CSS. Often people do not know the difference between JavaScript and Java and they end up understanding both as the same. Well that doesn't happen at all. These two languages are completely different. JavaScript is a very commonly used client side scripting language. Or we can say that it is used in all web browsers for handling error, exception, action etc. JavaScript is a scripting language, its code can also be written in HTML pages. So when a user requests an HTML page that contains a JavaScript, this script is sent to the browser and it is up to the browser what it wants to do with it.

Why are use the JavaScript 

  1. Game development
  2. building web server
  3. client and server side validation
  4. developing web and mobile apps
  5. add behavior  in web pages
  6. display popup menu and dialog boxes

Feature of JavaScript

  1. it is a structured programming language.
  2. JavaScript is an object-oriented programming language that uses prototypes, classes and objects.
  3. It is a light-weighted, interpreted language.
  4. It is a case-sensitive language.
  5. JavaScript is support in several operating systems including, Windows, macOS, etc.
  6. It provides good control and validation to the users on the web browser.


<!DOCTYPE html>

<h2>My First JavaScript</h2>
<button type='button' onclick = 'document.getElementById('demo').innerHTML = Date()'>Click me to display Date and Time.</button>
<p id='demo'></p>


What is JavaScript?