What is iOS App?
Native apps for iOS (iPhone and iPad) are written using Apple's developer tools. With Cocoa Touch, Apple provides a powerful framework for creating user interfaces. Cocoa Touch is the version of the Cocoa Framework optimized for touch devices, which was used to develop applications for the Mac before the time of iPhone & Co.
iOS (formerly iPhone OS) is a mobile operating system designed and developed by Apple Inc exclusively for its hardware. It is the operating system that powers many of the company's mobile devices, including the iPhone; The term also included versions running on iPads until the introduction of iPadOS in 2019, as well as iPod Touch devices, which were discontinued in mid-2022.
After Android; iOS is the second most widely installed mobile operating system in the world. The three other operating systems made by Apple (iPadOS, tvOS, and watchOS) run on this operating system.