A general table is a free-format table to which you can export data from Campaign. It is the simplest table type that can be created and is used only to export data from Campaign for use by other applications (general tables cannot be subsequently accessed in Campaign, unless you map them as base tables).
You use general tables in the Snapshot process to capture campaign data for use by other applications. For example, you can define the Snapshot process to store historical data or mailing lists in the exported general table.