Metadata

From Wikipedia, the free encyclopedia

Metadata (also Meta data) is data about data, that is information about other information. This is often useful. Libraries usually group books by subject. In that context the metadata about the book is the subject it is classified under. Digital cameras allow people to take pictures. In that context the data is the picture taken and the metadata is information about the picture taken like when (the date and time), where (perhaps using information from GPS), or how it was taken, For example, the photographic exposure details are also metadata about a picture taken by a digital camera.