CSS, which stands for Cascading Style Sheets, is a coding language used to define the visual appearance and formatting of web documents written in HTML. It provides a set of rules and instructions that control how elements of a webpage should be presented and displayed to users.

To understand CSS, imagine you have a plain HTML webpage with headings, paragraphs, images, and other elements. Without CSS, these elements would have default styles and be displayed in a basic, uniform manner. However, by using CSS, you can specify colors, fonts, spacing, backgrounds, borders, and other visual properties for each element, making the webpage visually appealing and organized.

CSS works on a cascading principle, which means that styles can be applied and inherited from multiple sources. Styles can be defined directly within an HTML document using inline styles, embedded within the HTML document using the