Explain the usage of Owned Entity Types (Value Objects in DDD).

Owned entities are types that can only exist alongside an owner entity and share its primary key, perfectly representing Domain-Driven Design (DDD) Value Objects.

Configured using OwnsOne() or OwnsMany(). By default, OwnsOne maps the properties of the owned type to the exact same table as the owner (table splitting), prefixing the column names. This keeps the database schema flat but allows the C# domain model to be richly structured.