ODBC Sources
Open Database Connectivity (ODBC) is a generic way for applications to speak to a database.
ODBC acts as an interpreter between an application (say a Cold Fusion or ASP application) and a database (like Microsoft Access). By using ODBC, a connector can be created that will allow a web application that you create to read data from and insert data into an Access database that you've created.
An ODBC source is a directory entry that specifies database information. This ODBC source (or DSN Source) allows your site to point to the correct database located on the web server.