App is the abbreviation of English Application. Due to the popularity of smartphones such as iPhone, the current APP refers to the third-party application of smartphones. At present, well-known app stores include Apple's iTunes Store, Nokia's ovi store, BlackBerry App World for BlackBerry users, and Microsoft's App Store. Apple's iOS system includes ipa, pxl and deb, Nokia's S60 system includes sis and SIXX, and Microsoft's windowsphone7 and windowsphone8 systems. The app format is xap. 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.