A database is a digital-data storage unit in which data is compiled in an orderly manner, in tables and fields. Flat databases are the most basic database design, made up of a single table. Today, most databases are complex, featuring multiple tables and fields that are interconnected. The more ordered the database, the easier for users to conduct rapid searches for information.
http://www.linfo.org/database.html http://www.techterms.com/definition/database http://en.wikipedia.org/wiki/Database