SAP has become a commodity which means that every big company has it. So Everybody should know a little of it.

Some tips

1.- SAP AG is the name of the German company that sells the product.
2.- SAP stands for Software, Applications and Products in data processing (in German of course).
3.- SAP R/3 is just the ERP product of SAP.
4.- SAP AG has also another products: SAP CRM (Customer Relationship Management). SAP BW (Business Warehouse). APO (Advance Planner and Optimizer), SEM (Strategic Enterprise Management), among many others. Check www.sap.com.
5.- SAP R/3 includes all the back office parts that a company may need to run its business:
FI - financial (Accounts payable, receivable, general ledger,etc)
MM - Material Management (Purchasing, Inventory.etc)
SD - Sales and Distribution
HR - Human Resources
PP - Plant Production
PM - Plant Maintenance
Basis - System Admin.
Abap - SAP programming language.
Many other R/3 Modules