Data sources combine the connection and driver information needed to work with both the Presto Repository and with other databases. Datasources can use either JDBC connections or a JNDI connection pool. Once you have created a data source, you and other users can use it as the source for any number of mashables or in mashups using EMML.

See Add a Data Source, Edit, Test or Remove Data Sources and Add or Manage JDBC Drivers for instructions.