Forum Moderators: open
ROI - Return on Investment.
PPC - Pay per Click.
Keep Smilin' :)
Billy
PPC as billy stated are pay per clicks, where you would goto GOTO for example, and bid on keywords, phrases on a per click basis, hence for something obscure, its $0.05 (which is the cheapest), but your imagination can take you to what you could possibly pay for more competitive search terms. Back to ROI = are you going to get the conversion from mere traffic coming through you site to sale's.
I personally don't bother with PPC's at the moment, but may change, will keep an eye on who go's PPC.
GOTO is the biggy at the Mo !