What Is Javascript

JavaScript is the world’s most popular programming language. JavaScript is the programming language of the Web. JavaScript is easy to learn.


JavaScript, often abbreviated as JS, is a programming language that conforms to the ECMAScript specification. JavaScript is high-level, often just-in-time compiled, and multi-paradigm. It has curly-bracket syntax, dynamic typing, prototype-based object-orientation, and first-class functions.

JavaScript is versatile and beginner-friendly. With more experience, you’ll be able to create games, animated 2D and 3D graphics, comprehensive database-driven apps, and much more!

JavaScript itself is relatively compact, yet very flexible. Developers have written a variety of tools on top of the core JavaScript language, unlocking a vast amount of functionality with minimum effort. These include:

  • Browser Application Programming Interfaces (APIs) built into web browsers, providing functionality such as dynamically creating HTML and setting CSS styles; collecting and manipulating a video stream from a user’s webcam, or generating 3D graphics and audio samples.
  • Third-party APIs that allow developers to incorporate functionality in sites from other content providers, such as Twitter or Facebook.
  • Third-party frameworks and libraries that you can apply to HTML to accelerate the work of building sites and applications.

Sample Code

Add the following code inside a blank .html, and open it in your browser of choice

<!DOCTYPE html>
      h1 {
        color: pink;
        font-size: 3rem;
      p {
        color: cyan;
        font-size: 1rem;
      button {
        padding: 1rem 2rem;
        background-color: gray;
        color: black;

    <h2>Hello World</h2>

    <p>You have clicked the button <span id="times">0</span></p>

    Click meeeee
    function buttonClick(){
      let times = document.getElementById("times");
      let numberOfTimes = parseInt(times.innerHTML) + 1;
      times.innerHTML = numberOfTimes;


Check out more on the official Mozzila website.

Also, you can check out the official Mozzila Tutorials.

You can also check W3schools website for JavaScript Tutorials.