What is the definition of metadata?

The correct choice defines metadata as "data about data." This means that metadata provides information that describes other data, enhancing understanding and usability. For example, in the context of a digital image, metadata can include details such as the date and time the photo was taken, the camera settings, the location where it was captured, and even descriptions or keywords associated with the image. This additional layer of information is crucial for organizing, discovering, and managing data effectively.

Metadata is essential in various domains, including geospatial information, where it helps users understand the context, quality, and lineage of geographical datasets. It allows for better data sharing and ensures that users can find and utilize the data appropriately.

In contrast, the other options do not accurately capture the essence of metadata. While the first option suggests that metadata enhances primary data, it doesn't encapsulate the broad definition. The third option mentions data processed by algorithms, which relates more to data analytics than to metadata specifically. Lastly, raw data without context does not represent metadata either; rather, it emphasizes the absence of informative qualities that metadata provides. Ultimately, metadata serves as a critical framework for understanding and managing various data types.