What is metadata?
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Metadata is data about data.
It provides the contextual information required to understand those data.
These include structural and descriptive metadata. Such data describe the structure, data elements, interrelationships other characteristics of data. They also permit data to be attributable to an individual. Metadata necessary to evaluate the meaning of data should be securely linked to the data and subject to adequate review.
For example, in weighing, the number 8 is meaningless without metadata, such as the unit, milligram, gram, kilogram, and so on.