Reuters

iOS is a mobile operating system exclusive to Apple’s iPhone, iPad, and iPod Touch series. First released in 2007, iOS debuted on the iPhone and has been a staple in each subsequent offering. iOS hit the larger iPad series in 2010 and took over for AppleTV with the second-generation release. The iOS system was frequently demonstrated by company founder Steve Jobs until his death on October 5, 2011. One week later, iOS 5 rolled out — the first of the post-Jobs era for Apple. The company launched iOS 9 in September of 2015. Popular features include the voice response virtual assistant Siri as well as split-screen (for iPad), the Apple News aggregator, voice dictation, and a stellar security reputation.