What Is a PubSub Methodology?

Event driven systems are an evolution of the so called PubSub methodology, publish, subscribe. The closest definition to a publish, subscribe method as we know it today was proposed in 1987. Now there are things like Apache flink or Kafka that allow you to implement this approach. And it's very powerful. In certain sectors, in certain sectors, it is very powerful because indeed that's the way you should be doing things.