What does related or dependent mean here?

Question

In Elements of Reusable Object Oriented software by Erich Gamma and friends, the intent for Abstract Factory Pattern says:

Provide an interface for creating families of related or dependent objects without specifying their concrete classes.

Can anyone explain in clearer terms what does author mean by related or dependent here.

Answer 1

Wikipedia says that "The abstract factory pattern provides a way to encapsulate a group of individual factories that have a common theme without specifying their concrete classes."

Take a look at the picture below.

"Related" here means that all of the concrete factories create buttons.