Facades are a programming pattern in which a simpler public interface is provided to mask a composition of internal, more-complex, component usages.
When writing a lot of NgRx code - as many enterprises do - developers quickly accumulate large collections of actions and selectors classes. These classes are used to dispatch and query [respectively] the NgRx Store.
Using a Facade - to wrap and blackbox NgRx - simplifies accessing and modifying your NgRx state by masking internal all interactions with the Store, actions, reducers, selectors, and effects.
For more introduction, see Better State Management with Ngrx Facades
