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ODBC is a 'standard' database connection, it allows access from an application (typicall) to a data source.
As it is a standard connectivity mechanism then most databases and applications can be enabled to use it.
ODBC is a very diverse connection method and hence the reason why is it widely used.
At Easysoft we find ODBC is a fast way to get data out of one system and into another, its a great data access tool.