Difference between PPDS PDS and CTM PDS

Hello,

I would similar to cognize the quality betwixt PPDS PDS and CTM PDS. Also, what volition beryllium the value and payment of utilizing CTM PDS? As I cognize that CTM PDS is created and sent to SAP APO utilizing BADI /SAPAPO/CURTO_CREATE wherever we person method CREATE_CTM_PDS, however does CTM PDS look successful SAP APO and however it behaves otherwise from PPDS PDS arsenic successful Integration Model we prime PPDS PDS lone to nonstop CTM PDS to APO.

Kindly help.