CSS, or Cascading Style Sheets, is an essential style sheet programming language used to define the look and feel of a website. It is a powerful tool for creating a consistent, aesthetically pleasing visual experience across multiple web pages. It contains information on fonts, color, spacing, layouts, and graphics, among others, and how each should be applied to the website. It's a great way to make sure the website looks the same on different devices, ensuring the best user experience possible. It also makes it easier for developers to maintain the website, as any changes made to the style sheet will be reflected across all pages that use it.

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