What Is Metadata?
Metadata is textual and sometimes graphical information that describes geographic information system (GIS) resources in the same way a card in a library's card catalogue describes a book. Once you've found a resource with a search, its metadata will help you decide whether it's suitable for your purposes. To make this decision, you may need to know how accurate or current the resource is and if there are any restrictions on how it can be used. Metadata can answer these questions.