Cascading Style Sheets (CSS) is the language that styles the visual presentation of web pages. Imagine it as the makeup artist for your website, applying colors, fonts, layouts, and animations to transform plain HTML content into a visually appealing and user-friendly experience. CSS allows for precise control over elements like text size, color, margins, positioning, and backgrounds. It also enables responsiveness, ensuring your website adapts seamlessly to different screen sizes, from desktops to mobile devices. By separating presentation (CSS) from content (HTML), CSS promotes cleaner and more maintainable code, making it easier to update the look and feel of your website without affecting its core structure.