Messages are persisted in a topic. Unlike point-to-point system, consumers can subscribe to one or more topic andconsume all the messages in that topic. In the Publish-Subscribe system, message producers are called publishersand message consumers are called subscribers.A real-life example is Dish TV, which publishes different channels like sports, movies, music, etc., and anyone cansubscribe to their own set of channels and get them whenever their subscribed channels are available.