A mobile application is a software equipped with a program. After downloading the latter, the file it contains is executed by an operating system. There are different types of mobile applications: native apps , web apps, and hybrid apps . 

The marketplace is now defined as a website on which independent sellers, professionals or individuals, have the possibility of selling their products or services online for the most well-known cases, a commission deducted by the site from each sale. . There are other business models based on fixed fees on sales, subscriptions, insertion fees, price per lead or seller services.