The PanGu Windows driver is a driver package used for facilitating communication between a Windows PC and an iOS device during jailbreaking or for certain operations with iOS devices using tools like PanGu. PanGu is a popular tool used for jailbreaking iOS devices (especially iOS 9.x to 10.x versions) by exploiting vulnerabilities in the iOS firmware. The Windows driver is required because, without it, the iOS device may not be properly recognized by the PC, preventing the jailbreaking process from proceeding.