Can someone explain the difference between GCM and Google Pub/Sub

Question

Google did answer the question here

https://cloud.google.com/pubsub/faq

But I\'m still unclear on which scenarios would each be used for?

Is there

Answer 1

Google Pub/Sub is the equivalent of the traditional SOA Enterprise Service Bus for message management whereas GCM/Firebase is more for notification services (for eg notifications to mobile). The primary intent of Google Pub/Sub is for server to server messages but can also be used for notifications services that GCM was intended for, sort of like a super set of GCM.