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The iPad is a line of tablet computers designed, developed and marketed by Apple Inc. Invented by Steve Jobs, the ipad is a revolutionary innovation that is increasingly being used in businesses, schools, homes, etc. It is product innovation that is incremental.

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The first IPad model was released April 3, 2010

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The first IPad model was released April 3, 2010

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"What we want to do is we want to put an incredibly great computer in a book that you can carry around with you and learn how to use in 20 minutes ... and we really want to do it with a radio link in it so you don’t have to hook up to anything and you’re in communication with all of these larger databases and other computers" said a founder of Apple and the inventor of the iPad, Steve Jobs.

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External Differences

•The original iPad and iPad 2 models share the same 9.7-inch multitouch "glossy" LED-backlit IPS display, and width and height are similar

•Depth is different as the original iPad is 0.5 of an inch thick and the iPad 2 is 0.34 of an inch thick.

•The iPad 2 is lighter

•The original iPad only was offered in black while the iPad 2 was offered in black or white.

•Both lines have aluminum backs.

•The original iPad line lacks cameras entirely whereas the iPad 2 models have front and rear mounted cameras.

Internal Differences

•Both iPad models have 16 GB, 32 GB, or 64 GB capacity options, have 802.11a/b/g/n Wi-Fi, an accelerometer, an ambient light sensor, digital compass, a speaker and a built-in mic.

•The original iPad models are powered by a custom ARM-based 1 GHz Apple A4 and have 256 MB of RAM and the iPad 2 models are powered by a faster, dual core 1 GHz Apple A5 and have 512 MB of RAM.

•Both lines have an estimated battery life of 10 hours of use over Wi-Fi and 3G-capable models are estimated to provide 9 hours of runtime over 3G.

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External Differences

•The rear camera on the iPad 3rd Gen line is higherquality.

•The iPad 2 models have a 0.7 megapixel camera that shoots stills and is capable of recording 720p video, whereas the iPad 3rd Gen models have a 5 megapixel "iSight" camera capable of shooting 1080p video.

•The iPad 3rd Gen also supports Siri when running iOS 6 or later, whereas the iPad 2 does not.

•The iPad 3rd Gen is slightly thicker -- 0.03 of an inch -- and about a tenth of a pound heavier.

Internal Differences

•The iPad 3rd Gen models are powered by a dual-core 1 GHz Apple A5X processor with quad core graphics whereas the iPad 2 models have an older dual-core Apple A5 processor with a single graphics processor.

•iPad 3rd Gen models have 1 GB of RAM whereas the iPad 2 only has 512 MB of RAM.

•Connectivity is substantially different.

•The iPad 3rd Gen models also support Bluetooth 4.0 whereas the iPad 2 models support the earlier Bluetooth 2.1+EDR standard.

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The iPad 4 was released November 2, 2012

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The iPad 4 was released November 2, 2012

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•The iPad 3 came with a 0.3MP standard definition offering, whereas the iPad 4 makes full use of the Retina display for video chatting with a 1.2MP HD camera.

•the iPad 4 packs Apple's latest A6X processor, which Apple says "doubles the performance of CPU tasks.

•The big difference between the two iPad generations lies within their connectivity options. The most obvious of these is the new 8-pin Lightning dock, first announced on the iPhone 5.

•The other major difference is that the iPad 4 comes LTE enabled.

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The iPad mini was released November 2, 2012

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The iPad mini was released November 2, 2012

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The iPad Air was released November 1, 2013

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The iPad Air was released November 1, 2013

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It was announced on October 22, 2013, and was released on November 1, 2013. The iPad Air features a thinner design with similarities to the contemporary iPad Mini 2, along with the same 64-bit Apple A7 processor with M7 coprocessor.

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The iPad mini 2 was released November 12, 2013

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The iPad mini 2 was released November 12, 2013

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The iPad air 2 was released October 22, 2014

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The iPad air 2 was released October 22, 2014

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The iPad mini 3 was released October 22, 2014

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The iPad mini 3 was released October 22, 2014

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The iPad mini 4 was released September 9, 2015

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The iPad mini 4 was released September 9, 2015

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The iPad pro was released November 11, 2015

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The iPad pro was released November 11, 2015