Persistent Store Coordinator
NS PersistentStore Coordinator documentation](https://developer.apple.com/documentation/coredata/nspersistentstorecoordinator)
Understand how the persistent store coordinator facilitates communication between the context and underlying data store.
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So far you know that Core Data represents models using Entities as managed object models. You also know that it creates these inside of a managed object context to create the object graph. As you modify the graph, the context keeps track of these changes. But what does it do with those changes?