- What is iOS
- iOS is Apple's mobile operating system for iPhone, iPod Touch, and iPad
- Originally called iPhone OS, renamed to iOS in 2010
- "i" branding comes from Apple's 1998 iMac introduction
- iPadOS Development
- iPadOS launched in 2019 as dedicated tablet operating system
- iPadOS features include dock, drag and drop, and picture-in-picture
- Both iPhone and iPad run iOS since 2010
- Latest Version and Updates
- Current public version is iOS 15.3.1 (released February 2022)
- New versions announced at WWDC in June
- Updates released after iPhone announcement in September
- Point releases add decimal points to version numbers
- Support for Older Versions
- Apple supports older iOS versions for security updates
- iOS 15 supports devices from iPhone 6s (2015)
- Older devices should upgrade to newer versions for security