What does this constraint in the class header mean?

Question

OOP

class Game< TFamilyType > : IGame where TFamilyType : IFamily, new()
{
//body
}

Answer 1

For this restriction to make sense, the Game class must be a generic class with a TFamilyType type parameter.
The constraint says that the type you substitute for TFamilyType when using the Game class must implement the IFamily interface and have a parameterless constructor.