Core Data

Core Data is Apple's object graph and persistence framework, used across macOS, iOS, watchOS, and tvOS. Implemented in Objective-C, it serializes data modeled as entities and relationships into XML, binary, or SQLite stores, and manages object lifecycle and persistence for you. It interfaces directly with SQLite so developers work with objects instead of raw SQL. It is often paired with Apple's CloudKit to sync data across devices, though several alternatives exist for both persistence and sync.