Adobe Flash Player
Steve Jobs also claimed that a large percentage of the video on the Internet is supported on iOS, since many popular video sharing websites such as YouTube have published video content in an HTML5 compatible format, enabling videos to playback in mobile web browsers even without Flash Player.
Comparison of HTML5 and Flash
Apple has been promoting HTML5 as an alternative to Flash for video and other content on the iOS, citing performance reasons for not allowing Adobe Flash Player to be installed on iOS devices, including the iPhone, iPod touch and iPad. Flash applications can be packaged as native iOS applications via the Adobe Integrated Runtime and the iOS Packager.