(Wechat applet is an application that does not need to be downloaded and installed. Realized the dream of "within reach". Users can scan or search for open applications. It also embodies the concept of "leaving after running". Users don't need to worry about whether too many applications are installed. Wechat "applet" can provide developers with wechat based development components such as forms, navigation, maps, media and locations, and allow them to build HTML 5 applications on wechat web pages. Meanwhile, wechat also opened login, wechat payment and other interfaces, so that this "applet" can be connected with the user's wechat account. Wechat defines "applet" as "a new form of application". Wechat emphasizes that applet, subscription number, service number and enterprise number are currently a parallel system.)