JavaScript can be used to change the appearance (CSS styles) of HTML elements. You can apply styles directly or trigger style changes through events like a button click.

Using the style property in JavaScript, you can change the CSS of any HTML element such as color, background, font size, etc.

Syntax: element.style.property = "value";

JavaScript can change styles when a specific event occurs, like when the user clicks, hovers, or focuses on an element.

This makes your website interactive and responsive to user actions.