What is metadata?

Metadata refers to data that provides information about other data. It plays a crucial role in organizing, managing, and understanding the context of the data it describes. For instance, in the context of a website, metadata can include details such as keywords, descriptions, and the author of the content. This information enhances search engine optimization (SEO) by helping search engines understand the content of the page and improves the overall user experience by providing context.

In contrast, the other options focus on specific aspects of web design or content types without addressing the broader concept of describing data. For example, while information about a website's design or graphical content is important, they do not classify as metadata. Similarly, audio files may be a form of content found on a website, but they do not pertain to the definition of metadata itself. Thus, the specific focus on the relational aspect of data makes the choice of "data that describes other data" the correct answer.