App comes from the English word “application” and is the description for application programs of any kind. But you also describe all applications for smartphones as app; smartphones can be equipped with numerous functionalities. Apps can be purchased in different online-shops and subsequent they can be downloaded directly and installed to smartphones.

There are numerous apps available and they are able to adapt to different mobile end devices. There are many simple apps as well as apps with complex functionalities. Besides apps which cost money there is also a huge offer of app-software for free available.