Difference between DSA,DMA& DST

Hi All,
Can someone help me out with a detailed explanation of what is a DSA , DMA & DST & what are the overalldifferences between a DSA , DMA & DST.
Thanks in advance
Vikram

DSA stands for Direct sales associates
DMA stands for Direct Marketing associates or agencies.
DST stands for Direct sales team.

DSA are service providere of banks or any marketing company.

DMA is a group or collection of service providers

DST is a team working within the company or a bank (But not on rolls) to promote or sell the product.

Pl revert for clarifications..

Regs,

good one idea to reply on it.