CSS stands for Cascading Style Sheets and is a programming language used to define the style of a website together with HTML. CSS is used to add style to a web page by dictating how a site is displayed on a browser. It is responsible for the text style, size, positioning, color, and more on a website. CSS is unique in that it doesn’t create any new elements, like HTML or JavaScript. Instead, it’s a language used to style HTML elements. CSS is used to define styles for web pages, including the design, layout, and variations in display for different devices and screen sizes. Without CSS, websites would look pretty boring. CSS can be used for very basic document text styling, creating a layout, and even for effects such as animation. CSS saves time, is efficient, and easy for users to learn and update, which makes global changes to style simple and quick. Overall, CSS is an essential language for web developers and designers to learn to create great-looking web pages.