Inheritance is the mechanism which allow to generalize / specialize classes into hierarchy, the base class being the most generic, the classes inheriting from this base class adding some specialization:
Vehicule
ground vehicule
car
truck
bicycle
Polymorphism is the ability to use an object without knowing exactly is type, just by using the base class as a type and being able to call method (virtual method) for it.
Having a virtual method StartEngine() on Vehicule, and having this method redefined for all the other class will allow to call that method on a pointer on Vehicule, and the corresponding method in the correct class will be called thanks to polymorphism.
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