ORDA class models revolutionize data management in 4D by introducing object-oriented principles. These models encompass Datastore, Dataclass, Entity, and Entity Selection classes. Datastore handles database connections, while Dataclass maps to tables and defines relationships. Entities represent individual records, and Entity Selection groups records. These classes enable streamlined data manipulation, queries, and filters. Leveraging ORDA classes enhances efficiency and maintainability, aligning with modern development paradigms within the 4D platform.