In-game purchases include virtual goods like coins and hearts that are bought by users while playing the game. App developers use this as a strategy to analyze app performance and increase user retention and user engagement with the game.
In-game purchases in android and iOS: In app-purchase for android are separated into subscriptions and one-time purchases. Compared to android iOS users tend to spend more on their apps and likely to purchase are these virtual goods.
To drive more users to make these purchases, app developers can use different ad units and use different app monetization strategies.