There are hundreds of thousands of applications available, ranging from maps and entertainment guides for business and money management. Many companies have developed iPhone apps for marketing purposes, such as grill manufacturer that provides recipes and grilling techniques, or a musician who creates games that tie in with their latest album. Magazines, newspapers, and websites also have their own product in the App Store that allows their content to be accessed easily on the phone. The game is very popular; app "Angry Birds", which started as an iPhone app in 2009, was so popular that it was adapted for other mobile platforms and has been downloaded at least 250 million times in mid-2011.
IPhone apps must be downloaded directly from the Apple iTunes store. Most are relatively inexpensive, and many are free. Other smart phones also have their own proprietary applications, so it is very important that the phone owner the right to download the phone.