Do you make money putting adds on free apps in the app store

I am a relatively new ios app development. I have submitted a couple of apps to the app store and have gotten a small amount of downloads. I see a lot of the most popular apps are free but they offer in app purchases. One of the most popular in app purchases is removal of adds. Does itunes connect have a system close to google adsense? If someone could give me some more information about this topic it would be very appreciated.

The answer to your question is yes, adMob is the Google equivalent to iAd which was apples in-App advertising API that was discontinued last June. You can Google adMod and FireBase and it will show you how. I just converted an app I am developing and it seems to work OK. Lot of screen output, though.

It sounds like google admob is what I am looking for.