What is metadata? Wikipedia says the following about Metadata: “Metadata is “data [information] that provides information about other data”.

Wikipedia gives as really good example of metadata that many of us will easily understand: “In the 2010s, metadata typically refers to digital forms; however, even traditional card catalogues from the 1960s and 1970s are an example of metadata, as the cards contain information about the books in the library (author, title, subject, etc.).”

Wikipedia says “Three distinct types of metadata exist: descriptive metadata, structural metadata, and administrative metadata.” They go on the define the three types as follows:

Descriptive metadata
Descriptive metadata describes a resource for purposes such as discovery and identification. It can include elements such as title, abstract, author, and keywords.
Structural metadata
Structural metadata is metadata about containers of metadata and indicates how compound objects are put together, for example, how pages are ordered to form chapters.
Administrative metadata
Administrative metadata provides information to help manage a resource, such as when and how it was created, file type and other technical information, and who can access it

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