The
iPad (
/ˈaɪpæd/ EYE-pad) is a line of
tablet computers designed and marketed by
Apple Inc., primarily as a platform for audio-visual media including books, periodicals, movies, music, games, apps and web content. Its size and weight fall between those of contemporary
smartphones and laptop computers. The iPad runs on
iOS, the same
operating system used on Apple's
iPod Touch and
iPhone, and can run its own applications as well as iPhone applications. Without
modification or a developer certificate, the iPad will only run programs approved by Apple and distributed via the Apple
App Store (with the exception of programs that run inside the iPad's
web browser).
Like iPhone and iPod Touch, the iPad is controlled by a
multitouch display—a departure from most previous tablet computers, which generally used a pressure-triggered
stylus—as well as a virtual onscreen keyboard in lieu of a physical keyboard. The iPad is sold with
Wi-Fi and
cellular models. The
Wi-Fi connection is used to access
local area networks and the Internet. Cellular models connect to mobile data networks with
3G or
4G in addition to Wi-Fi. Since the release of iOS 5, the device does not need to be managed and
synced by
iTunes running on a personal computer via
USB cable.