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iOS 9 is the ninth major release of the iOS mobile operating system developed by Apple Inc., being the successor to iOS 8.It was announced at the company's Worldwide Developers Conference on June 8, 2015, and was released on September 16, 2015.
Software versioning is the process of assigning either unique version names or unique version numbers to unique states of computer software. Within a given version number category (e.g., major or minor), these numbers are generally assigned in increasing order and correspond to new developments in the software.