Fields are smallest, single pieces of information in a database. Fields build up a record . A collection of records constitutes a database .
Many databases use the term words anywhere for the keyword search.
A database is an enormous filing system, consisting of records. This kind of controlled vocabulary is used to ensure consistency and order in the database. Subject headings constitute the subject field of a record. Keywords represent ideas and concepts of the searcher . They are an educated guess on the searcher s part on how data could be identified in the database.