Azure messaging service that enables reliable communication between distributed applications. Like a postal service specifically designed for computer applications to send messages to each other.
An order processing system uses Service Bus to notify inventory and shipping systems when new orders arrive.
Azure Service Bus is a managed enterprise messaging broker (queues and topics/subscriptions) with features like sessions, dead-lettering, and transactions. AWS commonly combines SQS (queues) with SNS (pub/sub fanout) to cover similar patterns. GCP Pub/Sub provides managed pub/sub messaging with at-least-once delivery and ordering options. OCI Queue provides managed queues; for pub/sub-style fanout in OCI, teams often pair queues with OCI Streaming or Notifications depending on the pattern.