<P> In recent years, the shortened term "app" (coined in 1981 or earlier) has become popular to refer to applications for mobile devices such as smartphones and tablets, the shortened form matching their typically smaller scope compared to applications on PCs . Even more recently, the shortened version is used for desktop application software as well . </P> <P> There are many different and not alternative ways in order to order and classify application software . </P> <P> By the legal point of view, application software is mainly classified with a black box approach, in relation to the rights of its final end - users or subscribers (with eventual intermediate and tiered subscription levels). </P> <P> Software applications are also classified in respect of the programming language in which the source code is written or executed, and respect of their purpose and outputs . </P>

Describe the application system and its type in detail