During installation, many products allow the use of Express versions of Microsoft SQL server. SQL Express is a free version of the paid SQL server software that limits the number of concurrent user connections and maximum database size that can be created.
SQL Express with Advanced services is recommended, which includes the Microsoft SQL Management Studio and SQL Reporting services modules.
Download SQL Express installer with Advanced Services directly from Microsoft.
As of this writing,
SQL Express 2008 with Advanced services is available here: http://www.microsoft.com/en-us/download/details.aspx?id=1842
SQL Express 2012 R2 (including SQL Management Studio) here: http://www.microsoft.com/en-us/download/details.aspx?id=29062