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Transportable tablespaces can quickly be moved across different platforms (with Oracle 10g, that is) (using convert tablespace). This allows databases to be migrated at almost the speed of a file transfer.
For example, data providers can deploy their data to customers that run Oracle on different platforms more easily. Also, usually, data marts are on different platforms as the data warehouse. With transportable tablespaces, the data can be 'copied' from the data warehouse to the data mart more efficiently.
See also v$transportable_platform.
Thanks to Mark Scalise and Chandra Movva who each notified me of a typo on this page.