Return on investment simply means checking if the money spent on marketing brings back profit. In digital marketing, a business might pay for ads or content creation. After that, they look at how much money came in from those efforts. If they spent 100 and earned 200, then the return is good. If they spent more than they earned, then something needs to change. It helps businesses know what is working and what is not. This way, they can focus on better results instead of guessing. Does this seem like a clear way to measure success?