Can you explain what CoreData is and what it is used for in iOS development?

Core Data is an Apple framework for managing data models in iOS and macOS applications. It provides a convenient way to store, retrieve, and manage data using an object-oriented approach.

Main features of Core Data:

• Managing the lifecycle of objects and their relationships.
• Caching and optimizing database queries.
• Supporting complex queries and sorting.
• Automatic saving of changes.

Core Data is not a database, but it typically uses SQLite under the hood for data storage.

Example of usage: you create a data model with entities (for example, "User"), and Core Data allows you to easily save and load objects of these entities without directly dealing with SQL queries.