What is an Interface

Question

With reference to UML diagrams, what is an interface? and can someone explain in more simpler words. I cant understand anything from googling it.

Answer 1

An interface is like a template design for a class that contains no data or implemetnation; only definitions for methods, properties etc. These are abstract and cannot be instantiated but can be inherited from at which point all specified methods etc must be implemented by the concrete class inheriting the interface.