Streams are a sequence of asynchronous data that sends when ready. Firestore sends updates to your list of pets when someone else adds or modifies a pet. In this episode, use a stream in your main file to listen for updates of your list of pets in your firestore database.
This is a companion discussion topic for the original entry at https://www.raywenderlich.com/21451798-beginning-firebase-with-flutter/lessons/6