I'm not positive, but I think it's data about your data. Say you've done some surveys. you have a bunch of people answering a question. Their answers are your data. but when you start saying "i have 500 responses, and a 95% certainty that my results are accurate to within +/-3% accuracy... THOSE numbers are meta-data.
There are only two hard things in computer science: cache invalidation, naming things, and off-by-one errors
the metadata is the data that defines your data. In the context of a database it would be the table definitions and things like that.
Joined: Dec 10, 2001
The term metadata is used to label information that describes information in the database world, as well as in other situations. Note that Java 1.5 is scheduled to include a metadata facility to allow classes, interfaces, fields, and methods to be marked as having particular attributes.