The Open-Closed Principle (OCP) is a principle in object-oriented programming that states that software entities (classes, modules, functions, etc.) should be open for extension but closed for modification.
This means that you should be able to extend the behavior of a module or class without modifying its existing code. Instead of modifying existing code, you should be able to add new functionality by creating new classes, interfaces, or functions that work with the existing code.
The idea behind the OCP is to create code that is more flexible, maintainable, and reusable. By following this principle, you can avoid making changes to code that is already working and instead focus on adding new features or functionality.
In practice, this can be achieved by using techniques such as inheritance, composition, and interfaces. By designing your code with these techniques in mind, you can create modules and classes that can be extended without modifying their existing code.