iOS is the operating system that powers a variety of Apple’s mobile devices. Unity includes native support for the iOS platform which means you can use Unity and its tools to create and deliver 2D and 3D applications for iOS.
Before you begin to develop an iOS application in Unity, check Unity’s requirements and compatibility documentation for iOS to make sure you’re aware of any limitations for developing a Unity application for this platform.
For general information about creating for iOS, see Apple’s developer documentation.