What is Javascript?

2 minute read


JavaScript is a widely used programming language that adds interactivity and dynamic features to websites. It’s a versatile language utilized for both front-end and back-end development, making it an essential skill for web developers. In this tutorial, we will provide a beginner-friendly explanation of what JavaScript is and explore some examples to help you grasp its fundamental concepts.

What is JavaScript?

JavaScript is a high-level, interpreted programming language designed to run in web browsers. Unlike HTML and CSS, which are markup languages used for structuring and styling web content, JavaScript is a scripting language that enables the creation of interactive and dynamic elements on web pages.

JavaScript empowers developers to control how elements on a webpage behave and respond to user interactions. It allows for tasks like user input validation, creating animations, fetching data from servers, and performing calculations, among other functionalities.

Example 1: Displaying an Alert Message Let’s start with a simple example. Consider the following code snippet:

alert("Hello, JavaScript!");

When this code is executed in a web browser, it triggers a pop-up dialog box displaying the message “Hello, JavaScript!”.


  • The 'alert()' function is a built-in JavaScript function that shows an alert dialog box on the user’s screen.
  • Inside the parentheses, we provide the message enclosed in quotes that we want to display.

Example 2: Changing HTML Content JavaScript can be employed to dynamically modify the content of HTML elements. Here’s an example:

<p id="myParagraph">This is a paragraph.</p>
<button onclick="changeText()">Change Text</button>

function changeText() {
  document.getElementById("myParagraph").innerHTML = "Text has changed!";


  • The HTML code consists of a paragraph ('<p>') element with an 'id' attribute set to “myParagraph.”
  • It also includes a button ('<button>') element with an 'onclick' attribute that specifies the JavaScript code to execute when the button is clicked.
  • Inside the '<script>' tags, we define a JavaScript function called 'changeText()'.
  • The 'changeText()' function uses the 'document.getElementById()' method to select the HTML element with the ID “myParagraph.”
  • By assigning a new value to the 'innerHTML' property, we change the text content of the paragraph element.


JavaScript is a powerful programming language that enhances the functionality and interactivity of web pages. With JavaScript, you can create dynamic content, handle user interactions, and perform various tasks on the client-side. This tutorial provided a basic introduction to JavaScript, along with simple examples to illustrate its capabilities. As you continue learning, you’ll discover numerous resources and frameworks that can help you leverage the full potential of JavaScript in web development.