What are the reasons involved in using the interface? - Delphi

What are the reasons involved in using the interface?

- Interfaces are used to implement the skeleton methods and provide a way through which the class can extend other classes.

- The example shows that a sub-class can extend the bicycle class that contains mountain bike, etc.

- They provide lots of inherited functions and features that can be added to provide unique features.

- They are allowed to apply one method to multiple classes and extend more than one class functionality and characteristics.

- High level classes can be defined using the interface in this case it can consists of methods and other definitions of classes.