Computer Terminology
Java Programming

What are metadata?

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Wiki User
2012-04-09 17:43:30

Metadata are data about data.

There are two kinds of metadata: "data about data content", and

"data about data containers".

Consider a file with a picture. The picture or the pixels inside

the file are data.

A description of the picture, such as "3 cute kittens, April

2012" are "data about data content", a kind of summary of the

data.

A description of the picture, like "JPEG format, 300x400

pixels", are "data about data container", because it describes how

the contents of the file are stored, although they are not the

actual data.

A library card catalog contains "data about data content", a

kind of summary of the data - the author, the time of creation,

etc.


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