CSS (Cascading Style Sheets) is a stylesheet language used in web development to define the presentation and styling of HTML documents. CSS separates the content (HTML structure) from the presentation (styling), allowing developers to control the visual design of web pages.
CSS rules specify how HTML elements should be displayed, including properties like colors, fonts, margins, padding, positioning, and more. CSS can be applied inline within HTML, within a style element in the document head, or as an external stylesheet linked to the HTML file.
CSS is essential for creating responsive, visually appealing, and consistent web designs. It plays a vital role in achieving the desired look and layout of web pages across various devices and screen sizes.