BW:Business Information Warehouse
SEM:Strategic Enterprise Management
CRM:Customer Relationship Management
APO:Advanced Planner and Optimizer

You have a lot of information about this products on the Internet.

I hope this helps.

Pablo

Iam new to the sap,i want to know what is longform of following & can give me brief explanation about that

BW,SEM,CRM,APO

Thanks & Regards
krishna