What is it
Pub/Sub is a messaging and streaming service provided by Google.
When to use it
It's useful for all kinds of event systems. Within the data engineering domain, we use it mostly to store and provide event data. E.g. telematics data from our trucks (1Hz frequency) or resource change events from our systems (shipment status update etc). We store PubSub events to BigQuery most commonly through a Cloud Run service.