What is JavaScript?

JavaScript is the programming language of the web. HTML structures the page, CSS styles it — JavaScript makes it interactive.

You can write JavaScript directly in your HTML using <script> tags:

<script>
  console.log("Hello World!");
  alert("I am JavaScript!");
</script>

Where does it run?

JavaScript runs in your browser — no installation needed!

Task

Click the button and see JavaScript in action. Then change the alert message!