[[Entity|Entities]] represent mutable domain concepts with consistent identity while protecting invariants and enforcing business rules. [[Factory|Factories]] handle object creation, and making Entities dependent on or referencing Factories violates the [[Separation of Concerns (SoC)]] principle. Dependence on Factories introduces technical details into the [[Domain Model]], reducing its clarity and focus. Entities should be reusable, and coupling them with Factories compromises that reusability. By keeping Factories separate, Entities are easier to test, as their behavior remains isolated from object creation.