Data Quality Services is only available in SQL Server Business Intelligence and Enterprise editions. You can choose to install the service during the normal installation of the database engine, or add it later on.
DQS allows domain experts, often referred to as subject matter expers (SMs) or data stewards, to improve the quality of data. This is good because it lifts the load from developers and DBAs who are rarely experts in the format and valid values of business data. However, that is not to say DBAs and developers can't use it; they can, and to great effect if they know the data, and now DQS can help achieve this.
DQS allows the data steward to create, refine and use reference data, as well as associate reference data with operational input data, whose quality needs to be improved. It produces a set of output data in the form of a new dataset, either in a table or in a CSV file. It does not alter the existing operational data, that is left to the...