What is iOS?
iOS is the world’s most advanced mobile operating system, and it’s the foundation of iPhone, iPad, and iPod touch. It comes with a collection of apps and features that let you do the everyday things, and the not-so-everyday things, in ways that are intuitive, simple, and fun.
What’s new in iOS 9.
iOS 9 brings you refinements at every level — from the apps you see on your Home screen down to the foundation of the system. Siri is smarter than ever, proactive suggestions keep you on track, and multitasking on iPad hits an all-new high with Slide Over, Split View, and Picture in Picture. All these enhancements enable your devices — and you — to do so much more every day.