SAP is a HUGE ERP (enterprise resource planning) application.
Take a business like Coca-Cola. SAP could be used for financial record keeping, Human Resources, Manufacturing, distribution, and on and on…
SAP specialists are very much in demand these days.
You can read more about SAP on their website at: SAP.
There are some other things that SAP can mean but, to just about any IT person, this is the most popular thing that would come to mind.
Does that answer your Question?
David Davis, CCIE