Which principle of OOP primarily deals with reusing code?

The principle of OOP that primarily deals with reusing code is inheritance. Inheritance allows a new class, known as a derived class or subclass, to inherit attributes and methods from an existing class, referred to as a base class or superclass. This mechanism enables developers to create a hierarchy of classes that share common functionality without needing to rewrite code, promoting code reusability and reducing redundancy.

For example, if you have a base class called "Animal" with common properties and methods like "eat" and "sleep," you can create subclasses such as "Dog" and "Cat" that inherit from "Animal." These subclasses automatically have access to the methods defined in the "Animal" class, allowing you to reuse that code and only define specific behaviors unique to each subclass.

This principle not only simplifies code maintenance but also enhances the organization of code by enabling the establishment of a clear relationship between classes, thus fostering modular design. By leveraging inheritance, developers can efficiently extend and modify existing code while maintaining a consistent and manageable codebase.