Data Migration is the process of moving data from one location to another (from legacy system to current system). When you introduce a new system (for example introducing Microsoft Dynamics 365 Business Central/ or want to replace Dynamics NAV with D365 Business Central) then data migration needs to be done.
Common use cases related to NAV Data Migration
Data Migration from NAV to Business Central – You can upgrade to Business Central from supported versions of Dynamics NAV on-premises, provided that your application customization is handled by extensions. However, the upgrade process depends on different factors, such as the version of Dynamics NAV that you are upgrading from, and the degree to which your solution differs from the standard version of Dynamics NAV. The mains tasks range from converting the database to upgrading application code and data.