Certified Internet Web (CIW) Professional Practice Exam

CSS stands for Cascading Style Sheets, which is a fundamental technology used in web development for controlling the presentation of web pages. Its primary purpose is to define how HTML elements are displayed on the screen, paper, or in other media. CSS allows developers to separate content from design, enabling them to apply styles such as colors, fonts, spacing, and layout to web pages in a systematic way.

By using cascading rules, developers can create a structured approach to styling, where multiple style rules can apply to a single element, with the "cascade" determining how conflicts are resolved. This makes CSS both powerful and flexible, allowing for efficient updates and alterations of a site's appearance without changing the underlying HTML content.

The other options do not accurately represent the function of CSS; they suggest incorrect definitions of CSS or misrepresent its capabilities. For instance, while each option alludes to some aspect related to web development, none capture the essence of CSS's role in styling web pages as clearly or correctly as the first choice does.