A: The abbreviation 'CSS' stands for 'Cascading Style Sheets.' Web style sheets are a form of separation of presentation and content for web design in which the markup (i.e., HTML or XHTML) of a webpage contains the page's semantic content and structure, but does not define its visual layout (style). Instead, the style is defined in an external stylesheet file using a style sheet language such as CSS or XSL. This design approach is identified as a "separation," in contrast to combining style and content within a single file.

This approach simplifies the maintenance of a website. If the appearance of a website needs to be changed, the CSS alone can be modified. Likewise, if content needs to be added to a website, simple HTML files can be added and their appearance will remain consistent because of the affect of CSS files. Enlisting the aid of a professional web designer or developer ensures that this separation of roles is done effectively, minimizing the cost of maintenance throughout the lifetime of a website.

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