DLL（Dynamic Link Library，动态链接库）是微软公司为Windows和OS/2操作系统设计一种供应用程序在运行时调用的共享函数库。DLL是应用程序的一种扩展，也是软件共享和重用的传统方法。-DLL (Dynamic Link Library, Dynamic Link Library) is a Microsoft for Windows and OS/2 operating system, to design a supply of running with the program called when the shared libraries. DLL is an extension of the application, but also the software sharing and reuse of traditional methods.