Based on the context and the answer, generate a question. 

Context: Search Engine Optimization ( SEO ) and Pay Per Click ( PPC ) advertising are the two leading strategies for attracting highly targeted traffic to your website . While industry experts argue that SEO earns more ROI than PPC , it does not mean that PPC is not useful or preferable . After all , the golden rule of marketing says - if your marketing campaign is making a profit , it 's worth it .

Answer:

It drives traffic to your product online .



What may be the reason for an online marketing campaign making you a profit ?