What is it
Cloud Pub/Sub is a fully managed product for distributed messaging, eventing and queueing.
When to use it
Use Cloud Pub/Sub for publish/subscribe use cases such as event streams and message queues.
Publishers to Cloud Pub/Sub can be, for example, internal backend services, external systems at the edge (such as truck telematics applications) or automatically emitted events by other Google Cloud products, such as Cloud Storage.