Push, pull mechanism observer pattern

Question

At the moment I\'m studying design patterns and I\'ve come to a part where I\'m confused whether the observer pattern makes use of the push mechanism or does it make use of

Answer 1

The observer pattern uses push since the observable object push notifications to its subscribers.

Push vs Pull (in web mostly): Push - the server sends(push) notifications to clients, this means it needs keep tracking on their address (URI) or in the more general case their reference.

Pull - the client is responsible for requesting fresh data from the server.

The pattern is not only for Web and is used all over, for example in desktop applications.