The Full form of IOS is iPhone Operating System. IOS is a mobile operating system created and developed by Apple Inc. exclusively for its hardware. It is the operating system of Apple Inc. that presently powers many of the company’s mobile devices, like iPhone, iPad, and iPod Touch. After Android, it is the second most popular mobile operating system globally. IOS was originally unveiled in 2007 for the iPhone, it has been extended to support other Apple devices such as the iPod Touch on September 2007 and the iPad on January 2010. Apple’s App Store contained more than 2.1 million iOS applications, 1,00,000 of which are native for iPads as of March 2018. Major versions of iOS are released annually. The current version, iOS 12, was released on September 17, 2018. It is available for all iOS devices with 64-bit processors; the iPhone 5S and later iPhone models, the iPad (2017), the iPad Air and later iPad Air models, all iPad Pro models, the iPad Mini 2 and later iPad Mini models, and the sixth-generation iPod Touch. On all recent iOS devices, iOS regularly checks on the availability of an update, and if one is available, will prompt the user to permit its automatic installation.