Master Data Services (MDS) is a Master Data Management (MDM) application built from platform components which may be deployed as an application or extended by use of the platform components to consistently define and manage the critical data entities of an organization. MDS is an ‘any domain’ hub that supports (but is not limited to) domains such as product, customer, location, cost center, equipment, employee, and vendor. Using MDS, customers can manage critical data assets by enabling proactive stewardship, enforcing data quality rules, defining workflows around data changes, notifying impacted parties, managing hierarchies, and sharing the authoritative source with all impacted systems. By doing so, they ensure consistency and control in the ongoing maintenance and application use of this information. MDS helps organizations standardize and streamline the business data they use across the organization to make critical business decisions. Take a look at the video overview here: http://www.microsoft.com/sqlserver/tour/en/videos/master-data-services.aspx