1. IOS and App Development
IOS (formerly I phone OS) is a mobile operating
System created and developed by Apple Inc
Exclusively for its hardware. It is the operating
Developer There are lot of Introduced with
version 13. 2019. It is the world’s second-most
widely installed mobile operating systems made
by Apple: I Pads, Source and Watch Os. It is
Proprietary software, although some parts of
It’s are open source under the Apple Public
Source Licensed and other licenses.