Reference:
Provisioning package works with Windows Configuration Designer to provision win10 features and runtime settings. WCD (provisioning Package) is GUI based while DISM is command line based and dose same function. Unattend.xml / answer files are used with installation media. It contains settings, definitions and values to use during Windows Setup. In an answer file, you specify various setup options. These options include how to partition disks, where to find the Windows image that will be installed, and which product key to apply.
https://docs.microsoft.com/en-us/windows/deployment/deploy-windows-mdt/create-a-windows-10-reference-image