How are the Liskov principles related to the concept of polymorphism in object-oriented programming?

The Liskov Substitution Principle (LSP) states that objects of a subclass should be replaceable with objects of the superclass without affecting the correctness of the program. This is closely related to polymorphism in OOP, which allows using objects of different classes through a common interface.

If a subclass violates LSP, replacing the superclass with the subclass may change or break the behavior, contradicting the idea of polymorphism.

For example, if there is a base class Bird with a method fly(), and a subclass Ostrich overrides this method to throw an exception (because ostriches do not fly), then LSP is violated. As a result, code working with Bird objects cannot correctly work with Ostrich objects.

Thus, adhering to Liskov's principle guarantees that polymorphism works correctly, and subclass objects can be used instead of superclass objects without unexpected side effects.