nspredicate nsmanagedobject nsmanagedobjectcontext nsentitydescription

Task of NSManagedObject, NSManagedObjectContext, NSEntityDescription, NSPredicate, NSPersistentStoreCoordinator

i am new in ios field, read the tutorial related to above class from apple official website. But i can't understand what is actually job of the NSManagedObject, NSManagedObjectContext, NSEntityDescription, NSPredicate given class. so please help me. Thank You.

Solution

Apple should put a link to Core Data Core Competencies in the tutorial.

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