What role does CSS primarily serve?

CSS, or Cascading Style Sheets, primarily serves the function of styling web pages. It provides a way to control the appearance of HTML elements by applying various properties, such as colors, fonts, spacing, and layouts. Through CSS, developers can create visually appealing designs, ensuring that websites are not only functional but also attractive.

By separating style from content, CSS allows for a consistent look across multiple pages of a website and enables easier updates and maintenance of design properties without altering the underlying HTML structure. This separation enhances a site's accessibility and performance as well.

In contrast to adding interactivity, which is primarily handled by JavaScript, and structuring content, which is managed by HTML, CSS focuses explicitly on the visual presentation and design layer of web development. Therefore, specifying that CSS is primarily for styling web pages accurately captures its core role within the broader web development process.