CSS (Cascading Style Sheets) is a style sheet language used for describing the look and formatting of a document written in a markup language. It is a widely used technology for designing and formatting web pages. CSS is used to control the presentation of content on the web, including the layout, colors, and fonts.

With CSS, designers can separate the presentation of a web page from its content, making it easier to maintain and update the look of the site. This is because the CSS code can be written in a separate file from the HTML content, and then linked to the HTML file. This allows changes to the presentation to be made globally, rather than having to make changes to each individual page.

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