Pub/Sub

Publish/subscribe fans one event out to every subscriber, with the publisher never knowing who — or how many — are listening. That fan-out is the point.

Message Queues

A message queue buffers work between a producer and a pool of consumers, delivering each job to exactly one of them, and demands idempotent consumers.

Change Data Capture (CDC)

Change Data Capture turns a database's own write-ahead log into a stream of events, so downstream systems stay in sync without the app publishing anything.