Adobe Flash is a multimedia platform used to add animation, video, and interactivity to Web pages. Flash is frequently used for advertisements and games.  Flash player is available free of charge for common Web browsers, some mobile phones and a few other electronic devices.

Now a days Apple's mobile devices continue to grow and hold the largest marketshare for mobile web browsing devices. If they don't allow Flash on their devices, the largest group of mobile web browsers (Apple's iPhone, iTouch and soon iPad) will have no access to their site or services on their mobiles.   Companies that have invested in flash  (and their customers) will be affected adversely, business and revenue will be lost.

Find More - http://www.freewindowstips.com/2010/09/01/how-to-install-flash-on-your-iphone-4/