What is containership or nesting of classes in Cpp?

Nesting of classes in Cpp

1. C++ supports another way of inheriting the properties of one class into another.
2. Here the class can contain objects of other classes as its members.

Example:

class alpha {   }
class beta {   }
class gamma
{
alpha a;
beta b;
……
};
This kind of relationship is called containership or nesting.