What does JavaScript allow you to do on a web page?

JavaScript is a powerful, client-side scripting language that enables developers to enhance the functionality of web pages by adding interactivity and dynamic content. Unlike static content, which remains unchanged once the page is loaded, JavaScript allows developers to manipulate the Document Object Model (DOM) in real-time, enabling features such as form validation, interactive graphics, and responsive elements that react to user input.

For example, when a user clicks a button, JavaScript can be used to show or hide elements, update the content displayed on the page without a full reload, and manage animations. This capability transforms a static HTML page into a more engaging and user-friendly experience, allowing content to adapt dynamically to user interactions and external data.

While styling page elements is typically handled by CSS, and optimizing server communication is more related to server-side technologies and methodologies (like AJAX for asynchronous requests), JavaScript specifically excels in creating interactive functionalities that enrich the user experience on a web page.