AngularFire2 is the name of the library where the Firebase API is wrapped in Observables. That means we can somewhat anticipate what it might look like when we want to listen for changes and so on. We will come back to the change scenario in a later section in this chapter. 

The official repository can be found at the following link: 

https://github.com/angular/angularfire2

Excellent documentation on how to do CRUD and work with authentication can be found at the bottom of the page the preceding link leads to.