The iPod touch is a unique device in many ways. The most significant example of this is its Multi-touch interface that enables users to easily control the device and type with their fingers. It also includes sensors that automatically re-orient the screen display to match the orientation of the iPod touch, such as switching to landscape view when the user rotates the phone 90 degrees when watching video. All iPod touch models include the applications Music, Videos, Photos, iTunes (providing access to the Wi-Fi Music Store), Safari, YouTube, Calendar, Contacts, Clock, Calculator, and Settings. Later models added Mail, Maps, Stocks, Notes, and Weather, which could also be added to the earlier models with the purchase of the iPhone 2.0 software upgrade for the iPod touch.
