The iPad 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, 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 used a pressure-triggered stylus—as well as a virtual onscreen keyboard in lieu of a physical keyboard.
History: Apple released the first iPad in April 2010, selling 300,000 units on the first day[22] and selling 3 million in 80 days.[23] During 2010, Apple sold 14.8 million iPads worldwide,[7][8][9] representing 75% of tablet PC sales at the end of 2010.[24] By the release of the iPad 2 in March 2011, more than 15 million iPads had been sold[25]—selling more than all other tablet PCs combined since the iPad 's release.[26] In 2011, it took approximately 73% of the tablet computing market share in the United States.[27] During the fourth quarter of 2011, Apple sold 15.4 million iPads.
Before launch
Apple 's first tablet computer was the Newton MessagePad 100,[29][30] introduced in 1993, which led to the creation of the ARM6 processor core with Acorn Computers. Apple also developed a prototype PowerBook Duo-based tablet, the PenLite, but decided not to sell it in order to avoid hurting MessagePad sales.[31] Apple released several more Newton-based PDAs; the final one, the MessagePad 2100, was discontinued in 1998.
Apple re-entered the mobile-computing markets in 2007 with the iPhone.