Definition - What does Data Management mean?
Data management refers to an organization's management of information and data for secure and structured access and storage.
Data management tasks include the creation of data governance policies, analysis and architecture; database management system (DMS) integration; data security and data source identification, segregation and storage.
Techopedia explains Data Management
Data management encompasses a variety of different techniques that facilitate and ensure data control and flow from creation to processing, utilization and deletion. Data management is implemented through a cohesive infrastructure of technological resources and a governing framework that define the administrative processes used throughout the life cycle of data.
It is a huge area, and this really is just an over-arching term for an entire segment of IT.