Which of the following best describes metadata?

The statement that best describes metadata is the one indicating that it is data that defines other data. Metadata serves a crucial role in data management by providing essential information about the data's characteristics, such as its source, format, context, and usage. Essentially, metadata enables users to understand and effectively utilize the data it describes. For example, in a database, metadata might include details about the structure of the database, such as the types of data fields, relationships between tables, and constraints. This layer of information enhances the usability and discoverability of data, making it an integral part of data governance and management practices.

The other choices encompass different types of data or concepts that do not accurately represent metadata. Large sets of structured data refer to databases or data warehouses, while unstructured data from various sources describes raw data lacking a clear format. Data analysis methods are concerned with the techniques used to examine and interpret data, rather than providing descriptive information about the data itself. Thus, the definition of metadata as data that defines other data is the most accurate and relevant choice.