Final answer:
In object-oriented programming, the subclass is the specialized class that inherits attributes and methods from a superclass, adding its own specific features.
Step-by-step explanation:
In an inheritance relationship within object-oriented programming, the subclass is the specialized class that derives from another class. This relationship means that the subclass inherits methods and attributes from another class, known as the superclass or parent class. However, the subclass may also have additional methods and attributes that make it more specific or specialized compared to its superclass.
A real-world example of this relationship could be a 'Car' class (superclass) that has attributes like colour and engine size, and methods like start() and stop(). A 'Convertible' subclass would inherit these characteristics but might also have an exclusive method like openRoof(). Therefore, the 'Convertible' is the subclass in this example, a more specialized version of the 'Car' class.