In-App Purchasing

In-app purchasing refers to the buying of goods and services from inside an application on a mobile device, such as a smartphone or tablet. In-app purchases allow developers to provide their applications for free. The developer then advertises upgrades to the paid version, paid feature unlocks, special items for sale, or even ads other apps and services to anyone who downloads the free version. This allows the developer to profit despite giving the basic app itself away for free.