Deployment Image Servicing and Management (DISM.exe)
The DISM tool replaces the Package Manager (pkgmgr.exe), PEimg, and Intlcfg tools used with Windows Vista. Deployment Image Servicing and Management or DISM consolidates the functionality found in those three tools, as well as delivers new functionality to improve the experience of offline servicing. When used in Windows 10/8, you get the added functionality. You can use DISM to: Additional read: Repair Windows System Image using DISM.
