Migrate is a new addition to Dell's SupportAssist consumer services portfolio. It allows a user to transfer their files and settings from an old PC to a new. This is not really anything new; however, the OEM claims that it is more effective in finding and applying data that makes a machine one's own.
https://www.notebookcheck.net/Dell-sets-up-a-new-Migrate-service-to-help-users-set-their-new-PC-up-just-like-the-last-one.464403.0.html