Data domains and sub-domains provide a structured framework for organizing data, facilitating detailed management and clear accountability. By categorizing data into logical groupings and further into more granular sub-domains, organizations can assign specific responsibilities and governance models. This hierarchical structure ensures that each data item is managed by the most relevant team, leading to improved data accuracy, consistency, and completeness. It also simplifies the process of identifying and addressing data issues, as accountability is clearly defined at each level of the data hierarchy.