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Metadata is  data about data. Two types of metadata exist: structural metadata and descriptive metadata. Structural metadata is data about the containers of data. Descriptive metadata uses individual instances of application data or the data content.hile the metadata application is manyfold covering a large variety of fields, there are specialised and well-accepted models to specify types of metadata. Bretheron & Singley (1994) distinguish between two distinct classes: structural/control metadata and guide metadata.
1) General Definition of the Term. Most definitions will give you a very short and simple explanation of what is metadata. Simply put, it is data that describes other sort of data. For example, keywords used for this article are part of its metadata.Author, date created and file size are also basic examples of a fileâs metadata.redictably, metadata in photography is information that describes not just some random documents and files, but image files. As with all sorts of metadata, it contains information on who made it, when, using what.