From the web site:
What is the unixODBC Project?
The unixODBC Project goals are to develop and promote unixODBC to be the
definitive standard for ODBC on the Linux platform.
What is ODBC?
ODBC is an open specification for providing application developers with
a predictable API with which to access Data Sources. Data Sources include
SQL Servers and any Data Source with an ODBC Driver.