CSS
CSS (Cascading Style Sheets) is a stylesheet language used to describe the presentation of HTML or XML documents, including colors, layouts, and fonts. It enables developers to separate content from design, allowing for responsive and visually appealing web pages across different devices and screen sizes. CSS works by applying rules to HTML elements to control their appearance and positioning on a webpage.
Developers should learn CSS because it is essential for creating modern, responsive, and user-friendly web interfaces, as it directly controls the visual layout and styling of websites. It is used in virtually all web development projects, from simple static pages to complex web applications, to ensure consistency, accessibility, and cross-browser compatibility. Mastery of CSS is crucial for front-end development, enabling tasks like building grid systems, implementing animations, and optimizing for mobile devices.