DQS or Data Quality Services, is a so called knowledge-driven solution, which means that it helps you improve the correctness of your data, by describing rules, definitions, error corrections, variations and other types of information about your data that you or other people in yor organization already might have, but it today stored in the heads of people instead of in a central, safe and secure place.
DQS focuses on the creation and maintenance of a Data Quality Knowledge Base(s) (DQKB) that is reused for performing various data quality operations, such as data cleansing and matching. In other words, you can with DQS gather, define, document and implement the improvements to your data in an easy way that you and your colleagues so far have not had the opportunity to do.
DQS is a rapid, easy-to-deploy, and easy-to-use data quality system that can be set up and used practically in minutes. It also integrates well with Master Data Services, Excel, SQL Server Database Engine ans SSIS. DQS is a part of the SQL Server 2012 Enterprise and Business Intelligence Editions. Read more about DQS here:p://social.technet.microsoft.com/wiki/contents/articles/3919.data-quality-services-dqs-faq.aspx