what is css ?

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CSS, or Cascading Style Sheets, is a stylesheet language used to describe the presentation of a document written in HTML or XML. It controls how elements on a web page are displayed, including layout, colors, fonts, and overall visual styling.

Key Features of CSS:

1. Styling: CSS allows you to apply styles (e.g., colors, fonts, spacing) to HTML elements. This separates the content (HTML) from its visual appearance.

2. Cascading: The term "cascading" refers to the way CSS applies multiple style rules. If more than one rule matches an element, CSS determines which one to apply based on specificity, importance, and source order.

3. Selectors: CSS uses selectors to target HTML elements. These can be based on element types, classes, IDs, attributes, and more.

4. Box Model: CSS uses the box model to layout elements on the page, considering margins, borders, padding, and the content area.

5. Responsive Design: CSS includes features like media queries that allow web pages to adjust their layout and appearance on different devices and screen sizes.

6. Flexbox & Grid: These are powerful layout modules that help create complex and responsive layouts more easily than traditional methods.