What does CSS stand for?

Cascading Style Sheets is the correct definition of CSS and represents a fundamental technology used in web development. CSS is utilized to describe the presentation of a document written in HTML or XML. It allows web designers to control layout, colors, fonts, spacing, and overall visual aesthetics across multiple pages of a website, promoting a consistent look and feel.

The term "cascading" refers to the way styles are applied and prioritized — multiple styles can be applied to the same element, and the order of those styles dictates which one takes precedence. This cascading nature of CSS provides flexibility and ease in maintaining style sheets, enabling designers to update a single file to have those changes reflected across all pages where the stylesheet is linked.

The other options provided do not accurately define CSS and relate to concepts that either do not exist or describe different aspects of style design. Understanding CSS and its capabilities is essential for any web designer, making it a foundational part of the web development toolkit.