# Code Example: Real-Time Pub/Sub
Kuzzle comes equipped with real-time pub/sub capabilities that can be used to send targeted notifications to client applications.
In this code example we will show you how pub/sub works with Kuzzle.
# Configure Kuzzle
First let's make sure Kuzzle is running and create the index and collection we will use to store documents. Follow these instructions.
# Create Your App
Now that we have our Kuzzle configured, we can start programming our App. Here is an outline of what the App will do:
- Connect to Kuzzle
- Subscribe to documents with specific criteria that Kuzzle will monitor
- Publish a document that will trigger the notification
Before we get started on the App, there are a few basics you need to know:
Firstly, a subscription is done at the collection level. This means that Kuzzle will only monitor changes to documents in the specified collection.
Secondly, unlike typical pub/sub solutions, there is no need to create a topic first. In Kuzzle, the topic is replaced by a document
filterwhich is sent by the Client when it makes a subscription request. Clients can subscribe using the same document filter, effectively simulating a
topic. For more information about subscriptions click here