So we can summarize by saying that data warehouse is the distinction between data and information. Data is composed of observable and recordable facts that are often found in operational or transactional systems. In a data warehouse environment, data only comes to have value to end-users when it is organized and presented as information. Information is an integrated collection of facts and is used as the basis for decision making. The data warehouse is that portion of an overall Architected Data Environment that serves as the single integrated source of data for processing information.