The Unified Data Model (UDM) is a new way to organize complex data in databases, combining different modern data models like E-R, Semantic Object Model, and UML. It helps design databases for things like objects, relationships, and multimedia. The UDM can work with various types of databases, like relational or object-oriented. A special diagram called the Unified Data Diagram (UDD) is used to design databases with this model. The UDM makes it easier to create logical views of data for database designs.