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The first-generation iPad showing its home screen Developer Apple Inc. Manufacturer Foxconn (on contract) 
Type Tablet computer
Wi-Fi model (U.S.): April 3, 2010  Wi-Fi + 3G Model (U.S.): April 30, 2010  International: May 28, 2010  iPad 2 (U.S.): March 11, 2011  iPad 2 (International): March 25, 2011 3rd gen (U.S.): March 16, 2012
Units sold 67.1 million (as of 31 March 2012) 
Operating system 5.1.1 Latest version released May 7, 2012
Power Built-in rechargeable Li-Po battery 25 W·h (90 kJ), 10hr life 
1st generation 1 GHz Apple A4  2nd generation 1 GHz Apple A5 3rd generation 1 GHz Apple A5X Storage capacity 16, 32, or 64 GB flash memory 
1st generation 256 MB DDR RAM  2nd generation 512 MB DDR2 RAM  3rd generation 1 GB DDR2 RAM 
1st & 2nd generation 1024 × 768 px 132 PPI 4:3 aspect ratio 9.7 in (250 mm) diagonal XGA, LED-backlit IPS LCD  3rd generation 2048×1536 px 264 PPI
1st generation PowerVR SGX535  2nd generation PowerVR SGX543MP2  3rd generation PowerVR SGX543MP4
Multi-touch screen, headset controls, proximity and ambient light sensors, 3-axis accelerometer, digital compass 2nd generation adds: 3-axis gyro
1st generation: None 2nd generation: Front-facing and 720p rear-facing 3rd generation: Front-facing and 1080p rear-facing
Wi-Fi (802.11 a/b/g/n) 1st & 2nd Generation Bluetooth 2.1 + EDR GSM models also include: UMTS / HSDPA (850, 1,900, 2,100 MHz) GSM / EDGE (850, 900, 1,800, 1,900 MHz) CDMA model also includes: CDMA/EV-DO Rev. A (800, 1,900 MHz) 3rd Generation Bluetooth 4.0 technology GSM models also include: LTE (700, 2,100 MHz) UMTS /HSDPA/HSPA+/DC-HSDPA (850, 900, 1,900, 2,100 MHz) GSM /EDGE (850, 900, 1,800, 1,900 MHz)
CDMA model also includes: LTE (700 MHz) CDMA/EV-DO Rev. A (800, 1,900 MHz) UMTS /HSDPA/HSPA+/DC-HSDPA (850, 900, 1,900, 2,100 MHz) GSM /EDGE (850, 900, 1,800, 1,900 MHz) Online services iTunes Store, App Store, iCloud, iBookstore
9.56 in (243 mm) (h) 7.47 in (190 mm) (w) 0.50 in (13 mm) (d) 2nd generation 9.50 in (241 mm) (h) 7.31 in (186 mm) (w) 0.34 in (8.6 mm) (d) 3rd generation 9.50 in (241 mm) (h) 7.31 in (186 mm) (w) 0.37 in (9.4 mm) (d)
Wi-Fi model: 1.5 lb (680 g) Wi-Fi + 3G model: 1.6 lb (730 g)  2nd generation: 1.325 lb (601 g) 3rd generation Wi-Fi model: 1.44 lb (650 g) 3rd generation Wi-Fi + 4G model: 1.46 lb (660 g) Related articles iPhone, iPod touch (Comparison) Website http://apple.com/ipad
The iPad ( /apæd/ 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 displaya departure from most previous tablet computers, which used a pressure-triggered stylusas well as a virtual onscreen keyboard in lieu of a physical keyboard.
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.
Apple released the first iPad in April 2010, selling
300,000 units on the first day  and selling 3
million in 80 days.  During 2010, Apple sold
14.8 million iPads worldwide,  representing
75% of tablet PC sales at the end of 2010.  By the release of the iPad 2 in March 2011, more than
15 million iPads had been sold  selling more than all other tablet PCs combined since the iPad`s
release.  In 2011, it took approximately 73% of the tablet computing market share in the United
States.  During the fourth quarter of 2011, Apple
sold 15.4 million iPads.