NgRx is an implementation of the popular pattern, Redux, that's meant for use with Angular. It is entirely possible to create an Angular application without NgRx. You might even be very successful in doing so. There are situations, though, where Redux can really help; you can get that help by using NgRx.
So, what is Redux and when do we need it? Redux is about adding predictability to your app. Predictability is about knowing who did what to the state in your application.
Single source of truth is a concept that Redux lives up to as it promotes adding all your data to one store. At any given moment, you will be able to tell what state your application is in. This is great if you want to save the state and come back to it (also called ...
