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Using Core Data.

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Core Data is a framework provided by Apple for managing and persisting data in iOS applications.
CORE DATA is not a Database. It is a wrapper around the SQLITE built into IOS. It is an object graph manager that handles data persistence, usually using SQLite as its storage technology in the background.
Here’s a brief rundown of some key concepts and components within Core Data:
Managed Object Model: The Managed Object Model is like the schema in a traditional database. It consists of entities (like tables) and attributes (similar to table fields). ​The Managed Object Model is visualized and developed using Xcode's visual editor.
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https://coda.io/@peter-sigurdson/steps-to-make-a-managed-object-model-with-xcode
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Persistent Store Coordinator: This component manages the interaction between the Managed Objects in the application, the Managed Object Context, and the physical data files that reside in the device's storage.
Managed Object Context: This can be seen as a temporary working space or "scratch pad" where data objects (Managed Objects) are created, modified, and deleted. Changes made in this context aren't persisted on the device until the save() method is called.
Managed Objects: These are instances of your data objects, with attributes and relationships defined in the Managed Object Model.
With Core Data, developers can implement complex data manipulation operations, manage large data sets, and synchronize data across different iOS devices. Though Core Data might have steep learning curve for beginners, it is an efficient tool for managing complex data-driven applications. It handles undo and redo operations, tracks changes, and also supports iCloud integration for data sharing across multiple devices.
When creating an app with Core Data, developers first set up a data model within Xcode's visual editor, and then perform Create, Read, Update, Delete (CRUD) operations within the Managed Object Context. Data is fetched from the persistent store into the Managed Object Context, and any changes are saved back to the persistent store. Core Data handles all the heavy lifting, making it faster and easier to work with data.
Given the right understanding and usage, Core Data is a very powerful tool for iOS developers that can handle most data persistence needs in an efficient and effective way. It also integrates well with Apple's other frameworks, making it a good choice for Apple ecosystem development.

In Core Data, entities are managed objects. A managed object is an instance of a specific entity in the managed object model. You can think of entities as being like tables in a traditional database, and managed objects as being individual rows or instances of those tables.
In the context of Core Data, a managed object represents a single instance of a specific entity and encapsulates the data associated with that instance. Each managed object has attributes (similar to table fields) that store the data for each property defined in the entity. Managed objects can also have relationships with other managed objects, allowing for complex data modeling.
When working with Core Data, you can create, modify, and delete managed objects within a managed object context. The managed object context acts as a scratchpad for working with managed objects and tracking changes. Changes made to managed objects in the context can then be saved to the persistent store to persist the data.

Conclusion:

Entities in Core Data are represented by managed objects, and managed objects are instances of those entities that store the data associated with them. q
Now deepen your Knowledge by reading Chapters 22 and 23 of Big Nerd Range Guide to IOS
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Steps to start making a simple IOS app which uses Core Data:

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https://coda.io/@peter-sigurdson/steps-to-make-a-managed-object-model-with-xcode
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