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I read the whole thing. That's why I have the question. So they used to have messages send to everyone (websocks?), now they have the messages persistent in different channels for people to consume. Isn't this just different entry points of a Rest API?

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Why are you confusing something that could be used to implement the back-end of a REST API (Kafka) with the idea of a REST API?

Your question makes as much sense as: why is <new database X> any different from SQL?

I got my understanding from the illustrated book...

OK. So I didn't get what Kafka is.

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