In-app purchases, which allow users to purchase virtual goods or premium features within the app itself, have become a popular method of monetizing mobile applications. Often used in gaming applications, this model allows users to buy in-game currency, power-ups, or exclusirummy momentve items to improve their gaming experience. Productivity apps also make use of in-app purchases, which give users the option to buy premium content or unlock extra features. Frequently linked to the freemium model, the in-app purchase model allows users to enhance their app experience through in-app purchases, even though the app is available for free download. Offering a free version of their app to a wider audience while still making money from users who choose to make in-app purchases is how developers are able to achieve this strategy.