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A data mart is a part of a data warehousing system and refers to a specific subset of data relevant to a particular business unit or department within an organization. Unlike the comprehensive data warehouse, which contains all of the organization's data, a data mart is tailored to specific needs and requirements and contains only the data relevant to a particular group of users.
A data mart is typically smaller than a data warehouse and can be implemented more quickly and at a lower cost. It can also be more flexible because it is tailored to specific requirements, making it easier to customize. Data marts can also operate independently, allowing users to access the data that is relevant to them without having to search the entire data warehouse.