What is NgRx app State?

You can think of ngrx as a client-side messaging system. The user clicks a button, and the app sends a message (for example, dispatches an action). The app state changed because of this button click, and the ngrx Store sends a message to the subscriber(s), emitting the next value into an observable stream .

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What is the use of provider?

In a nutshell, Provider gives us an easy, low boiler-plate way to separate business logic from our widgets in apps . Because it’s built on InheritedWidget classes, it also makes it easy to re-use and re-factor business logic. Separating state from your UI is one of the main problems that Provider solves.

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