https://milanjovanovic.tech/blog/entity-vs-value-object-ddd

In Domain-Driven Design (DDD), Entities are tracked by a unique ID that stays the same even if their properties change, whereas Value Objects have no ID and are defined completely by their attribute values. [1, 2, 3]

Entities

Unique Identity: Defined by a persistent identifier (like a primary key, user ID, or social security number).

Mutable: Their attributes and state can change over time while the object remains the same entity.

Lifecycle: They track a business lifecycle and history.

Examples: Customer, Order, Product, Invoice. [1, 2, 3, 4, 5, 6]

Value Objects

No Identity: They do not have a unique identifier. Two value objects with the exact same data are considered equal.

Immutable: They cannot be modified after creation. If a value needs to change, you replace it with a brand-new instance.

Interchangeable: If you swap one value object for another with identical values, the business model treats them as the exact same thing.

Examples: Money ($100 is $100), Address (street, city, zip), Email, DateRange. [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]