What are the objects?
You already know where the integer data type named int comes from.
It is a type, which, along with float, long, double, etc., is intrinsic to both C and C++.
You probably don't know about the abstract data type named Date.
You will learn how to define new data types and then to create instances of them (objects).
So, what are the objects? They are the variables that you declare using abstract data types.