Metadata is data information that provides information about other data. Three distinct types of metadata exist: descriptive metadata, structural metadata, and administrative metadata.
- Descriptive metadata: this metadata describes a resource that enables discovery or identification; elements can include (for example) title, abstract, author and keywords.
- Structural metadata: this metadata is about containers of metadata and how compound objects are put together for example, how pages are ordered to form chapters.
- Administrative metadata: this metadata provides information to help manage a resource, such as when/how a resource was created, the file type, technical information and who has the ability to access it.