CSS (Cascading Style Sheets) is a style sheet language used for describing the presentation of a document written in HTML or XML. It defines how elements are to be displayed on a screen, in print, or spoken in speech. CSS allows web designers to control the layout, colors, fonts, and other aspects of the visual presentation of a web page or application.
CSS works by associating style rules with HTML elements. These rules can be specified internally within an HTML document, in a separate CSS file, or inline within individual HTML tags. CSS rules consist of selectors, which target specific elements, and declarations, which define the style properties to be applied.
One of the key benefits of CSS is its ability to separate the structure and content of a web page from its presentation. This allows for greater flexibility and maintainability when designing and updating websites. CSS also supports advanced features such as media queries, which allow for responsive design, and animations, which add interactivity to web pages.
CSS is an essential tool for web developers and designers, enabling them to create visually appealing and user-friendly websites and web applications. It is supported by all modern web browsers and is continuously evolving to support new features and standards.