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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.
The underlying concepts of metadata have been in use for as long as collections of information have been organized. For example, the information structure for materials in library card catalogs is a type of metadata that has served as a collection management and resource discovery tool for decades. Using metadata, it is possible to create customizable tags for markup languages such as XML and SGML.