In SAP S/4HANA, a Business Partner (BP) is a central, unified master data object used to manage all parties a business interacts with - such as customers, vendors, and contact persons - in one single place.

Data Migration Cockpit (DMC) in SAP is a tool within the SAP system that is used to migrate data from Legacy data system into the SAP

LTMC is a tool which allows you to transfer data from Non SAP system to SAP system. LTMC transfers Master Data, transactional data & balance