IMO at very high level both a pub-sub and stream based system is the same thing. Both are event driven. But it differs at implementation level. A pub-sub is di

IMO at very high level both a pub-sub and stream based system is the same thing. Both are event driven. But it differs at implementation level. A pub-sub is discrete, not composable and time (or latency or whatever you call it) is captured indirectly through state. While a Stream is continuous, composable, transformable and time is the first class citizen. For example look at the Dart's Streams (https://www.dartlang.org/docs/tutorials/streams/ https://www.dartlang.org/docs/tutorials/streams/) and NodeJS's IO. Both are event-driven but differs in how you program. Reactive Streams eliminate the callbacks (or event handlers) from async code and can be combined with other streams.