A Value Object is a domain object that has no unique identity but if any of its properties change it is no longer the same. An example can be made with money.

```py
from dataclasses import dataclass

@dataclass(frozen=True)
class Money:
  type: str
  value: int

Money("Euro", 10) != Money("Euro", 9)
Money("GBP", 10) != Money("Euro", 10)
```

Thus such an object is a perfect candidate for immutability. With python we can add @dataclass(frozen=True). Frozen=true makes it immutable.