Another Object-Oriented Programming core principle.
Inheritance is about derivating the common behavior of different classes from a parent class that implements that particular behavior (e.g. both Car and Motorcycle are a Vehicle and may have common methods, like accelerate(), tank() etc.).
Only the methods that are tailored for one of the child classes should be kept in particular child classes (e.g. only the Car class should have openTrunk() method, as motorcycles don't have trunks).
[!danger] I know nothing of motorcycles, maybe they, in fact, have trunks.
Inheritance allows us to reuse the common counterparts of the code.