DBM vs. Dealers Portal

Hi All,

Need help in understanding difference between Dealers Portal and DBM.

At present we are planning to activate VMS, but we need Dealer interaction as well in the Business. I understand that we can activate DBM and VMS to leverage the combined functionality.

http://help.sap.com/saphelp_dbm700/helpdata/en/c8/79b444f7004469a1610b33bfe486ff/content.htm

But befor going for that, we want to have some understanding of Dealer Portal.

Please shed some light over this.---> How Dealer Portal is different from DBM.

Regards,

Avinash