I keep hearing people talk about ROAS and ROI but honestly don't understand what makes them different. My boss asks about both numbers in meetings and I just nod along pretending I know what he means. One measures return on ad spend and the other measures return on investment but they seem like the same thing to me. The difference between ROAS and ROI must be important since everyone uses both terms but nobody ever explains it simply. I need to figure this out before the next marketing meeting so I don't look clueless again