Event-driven architectures build on a common pattern in software development known as publish-subscribe or observer pattern.
In an event-driven architecture there are at least two actors: the subject and the observer.
The subject is like an FM radio, it broadcasts a message to any observer interested in listening what the subject has to say.
There could be just one or one hundred observers, it does not matter as long as the subject has some message to broadcast.
Keep in mind that event-driven, publish-subscribe, and observer pattern are not the same thing in practice, but ideally they use the same approach: an entity broadcasts a message while other entities listen for it.
The publish-subscribe pattern is old as me. It's been theorized around 1987, while the observer pattern appeared in the quintessential book "Design patterns" by the gang of four in 1994.
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