JavaScript is a programming language that can be used in HTML to add interactivity and dynamic functionality to web pages. It can be used to create effects such as pop-up windows, form validation, and image sliders. JavaScript code can be added directly to an HTML document using the <script> tag, or it can be linked to an external file using the src attribute. JavaScript can also be used to manipulate the Document Object Model (DOM) of a web page, allowing for dynamic changes to the layout and content of a page. Overall, the use of JavaScript in HTML allows for a more engaging and interactive user experience on web pages.
