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Redefining a base class function is when a derived class has a function with the same name as a function in its base class, but the function in the derived class is not meant to override the base class function. It has a completely new and independent implementation. Overriding a base class function is when a derived class has a function with the same name and same signature as a function in its base class, and the derived class provides a new implementation for the function intended to extend or modify the base class function's behavior. Example of Redefining: ```cpp class Animal { public: void Speak() { /* ... */ } }; class Dog: public Animal { public: int Speak(std::string message) { /* ... */ } }; ``` Example of Overriding: ```cpp class Animal { public: virtual void Sound() { /* ... */ } }; class Dog: public Animal { public: void Sound() override { /* ... */ } }; ``` In the redefining example, the `Dog` class has its own independent implementation of `Speak` function. In the overriding example, the `Dog` class provides a new implementation for the `Sound` function that replaces the base class function when called on a `Dog` object.