Liskov substitution principle

The Liskov Substitution Principle is about making sure a program works properly, no matter what changes are made in it. It's like a science experiment: you can add different ingredients, but the experiment still needs to come out the same way. In computer programming, the Liskov Substitution Principle means that if you have a program with different pieces (classes) working together, you can change one of those pieces without breaking the program. So, if you have a program that uses certain classes, you can substitute those classes with other classes and the program should still work the same way.