CSS
CSS (Cascading Style Sheets) is a crucial technology used to control the presentation and layout of web pages. It defines styles for HTML elements, including colors, fonts, spacing, positioning, and responsiveness. CSS enables developers to create visually appealing and consistent designs across different screen sizes and devices. With modern techniques like Flexbox, Grid, animations, and pre-processors like SCSS, CSS plays a key role in building engaging and user-friendly interfaces.