There are two different types of apps premium and free, which is developed by app developers. For the premium apps, users have to pay for the app to download it on their devices and free maps can be downloaded from on your devices. The problem that most of the developers face is the app monetization.
Since its conception Android is making its presence louder and when we got the Android Tablets it hit hard the iPad market. Though still many of my friends are still in love with Apple but a substantial number of customers are using Android tablets.