What are topics and subscriptions?

- [Instructor] So now that you understand what…Service Bus Queue's are, lets understand what…Service Bus Topics and Subscriptions are.…A topic, well it's just like a queue, the only difference is…that it can have multiple subscriptions.…So, a queue, generally you just have a listener, right?…But in the case of a subscription or a topic,…the topic is, lets say, invoices…and subscribers would create subscriptions…based on a certain criterion of that invoice.…

So you can say, invoices for this client…go to this receiver; that would be a subscription.…So it allows you to do things like say, filter messages.…So a subscriber only receives messages that they care about.…So this is typically how it looks like.…Now this is not the only way…topics and subscriptions can be used.…In fact here, I'm demonstrating a very specific scenario,…where three different receivers can get the same message.…

Certainly that's not the only way…topics and subscriptions can be used effectively.…Let me explain...…So, the important difference between queues…