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What is CSS 3?

CSS, which stands for Cascading Style Sheets, is a stylesheet language used for describing the presentation and formatting of a document written in HTML or XML. CSS allows developers and designers to control the layout, styling, and appearance of web pages, making it an essential technology for web development.

Key features and aspects of CSS include:

1. Style and Presentation: CSS is used to style and format the visual presentation of HTML or XML documents. It defines how elements such as text, images, and other HTML elements are displayed on the screen or other media.
2. Separation of Concerns: CSS promotes the separation of content and presentation in web development. This separation makes it easier to maintain and update a website because changes to the styling can be made without altering the underlying HTML structure.
3. Responsive Design: CSS supports responsive design, allowing developers to create layouts that adapt to different screen sizes and devices. Media queries can be used to apply different styles based on factors like screen width, height, or device type.