In web design, what does CSS stand for?

The correct answer is Cascading Style Sheets, which is the widely recognized definition of CSS in web design. CSS is a stylesheet language used to describe the presentation of a document written in HTML or XML. The term "cascading" refers to the way that styles can be applied in a layered or hierarchical manner, allowing for greater flexibility and control over the appearance of a web page. This cascading effect enables developers to write styles that can be modified or overridden, depending on specific conditions or contexts, which is essential for responsive design.

The other choices, while they may sound plausible, do not correctly describe CSS. "Computer Style Sheets," "Creative Style Sheets," and "Colorful Style Sheets" may represent various concepts related to styling but lack the formal definition and function associated with Cascading Style Sheets in web development. Understanding CSS is fundamental for web designers, as it plays a crucial role in ensuring that websites are visually appealing and user-friendly.