Covariant
The type can vary in the direction as the subclass.
Contravariant
The reverse of covariant.
Example in Generics
| Language | Covariant | Contravariant |
| C# | IList<out T> | IList<in T> |
| Java | List<? extends Number> | List<? super Integer> |
Covariant vs Contravariant
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