Data warehouses can be subdivided into data marts. Data marts store subsets of data from a warehouse.
Data Mart is the access layer of the data warehouse environment that is used to get data out to the users. The data mart is a subset of the data warehouse that is usually oriented to a specific business line or team.
In deployments, each department/business unit is considered the owner of its data mart including all the hardware, software and data.
Each department able to manipulate and develop their data any way they see fit; without altering information inside other data marts or the data warehouse.
Read more: http://en.wikipedia.org/wiki/Data_mart
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