Product Classification vs Product Intended Use

Hi,

Can anybody explain which is the difference in the functionality resulted of setting up Product Fiscal Classifications and Product Intended Use Fiscal Classifications?

From the reading of the user guide I understand that is possible to setup Product Fiscal Classifications in Ebtax and link them to Inventory Category Sets and then use the Product Fiscal Classifications to define tax rules but I am not clear which is the difference with the Product Intended Use Fiscal  Classifications.

Thanks,

cv