APP refers to the third-party application of smart phones. Well-known app stores include Apple's App Store, Google's Google Play Store, Anzhi Market, BlackBerry App World for BlackBerry users, and Microsoft's Marketplace.

Apps are usually divided into individual user apps and enterprise apps. Individual user app is aimed at individual consumers, and enterprise app is developed for enterprise users. When the Internet enters the era of mobile Internet, many enterprises and individual developers hope to make money from it, but most people focus on the application for individual users, ignoring enterprise-level mobile applications. Nowadays, the competition in the individual market has entered a white-hot stage, and the development speed tends to be slow. In 20 13 years, the estimated market size is 1 109 billion. In contrast, the enterprise market has just started. In 20 13, it is estimated that the market scale will reach124.4 billion, which is developing at a high speed with a growth rate of 50%. In this market environment, third-party services are needed to solve the problems of both enterprises and developers, which can realize two-way demand convergence, marketing distribution, efficiency improvement and cost reduction, and can provide corresponding services for both parties. The application factory plays such a role, aggregating upstream and downstream resources and becoming the first one-stop service platform for enterprise-level mobile applications in China. At first, APP only participated in Internet business activities as a cooperative form of third-party applications. With the increasingly open Internet, APP, as a budding profit model with the iphone, has begun to be valued by more Internet business tycoons. For example, Tencent's Weibo development platform and Baidu's Baidu application platform are all concrete manifestations of the idea of APP. On the one hand, it can accumulate various types of network audiences, on the other hand, it can obtain traffic with the help of APP platform, including mass traffic and targeted traffic.