We have come to a point where it is actually really hard not to use at least one of these services even if we try and companies built to prove the opposite have failed miserably RIP Cyanogen. But most of us have never actually paid for these services. How is this possible? Is it so easy googlw Google to create all of these things that they just give them for free? Of course not. So the quick answer to our question is ads. AdWords is the software determining which ads will be presented in the Google webpage and AdSense publishes ads on other websites.