It is a "Massive database (typically housed on a cluster of servers, or a mini or mainframe computer) serving as a centralized repository of all data generated by all departments and units of a large organization. Advanced data mining software is required to extract meaningful information from a data warehouse. The term was coined by the US consultant W. H. Inmon." (from BusinessDictionary.com)
To research Data Warehouses use the resources listed below, or go to the list of "Information Resources" in the box on the right.