What do you know about Barbara Liskov's principle (LSP)?

The Liskov Substitution Principle (LSP) is one of the five SOLID principles in object-oriented programming. It states that objects of a subclass should be interchangeable with objects of the superclass without violating the correctness of the program.

In simpler terms, if class B inherits from class A, then objects of class B should behave in such a way that they can be used in place of objects of class A without unexpected errors or changes in logic.

This means that subclasses should not alter the behavior of the base class in a way that breaks its contract (for example, changing preconditions, postconditions, invariants). Adhering to LSP ensures the reliability and predictability of class hierarchies.