From the client point of view, it means that a client can create a family of related objects without knowing about the object definitions and their concrete class names. In the abstract factory pattern you provide an interface to create families of related or dependent objects, but you do not specify the concrete classes of the objects to create.
The abstract factory pattern is one of the classic Gang of Four creational design patterns used to create families of objects, where the objects of a family are designed to work together.
