How should I have explained the difference between an Interface and an Abstract class?

An interface is a collection of abstract methods that define a set of functions that a class must implement. An interface does not provide any implementation for these methods, and a class that implements an interface must provide an implementation for all of the methods defined in the interface.

An abstract class, on the other hand, is a class that cannot be instantiated and is used as a base class for one or more derived classes. An abstract class can contain both abstract and concrete methods, and it can provide a default implementation for some of its methods. A derived class can override the abstract methods and the methods with a default implementation as needed.

Here are a few key differences between interfaces and abstract classes:

1. Interfaces only contain abstract methods, whereas abstract classes can contain both abstract and concrete methods.

2. A class can implement multiple interfaces, but it can only extend a single abstract class.

3. An interface is a pure abstraction and cannot contain any implementation code, whereas an abstract class can contain both abstract and concrete methods.

4. An interface is used to define a set of related functions that a class must implement, whereas an abstract class is used to define a base class that can be shared by multiple derived classes.

I hope this helps. Let me know if you have any questions.