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The 2nd generation iPad had face-time added on it & it was 33% thinner and 15% lighter that the 1st.
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The first iPad was powered by the same operating system as the iPhone just bigger. The iPad has many of the same features as a iPhone.
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The 3rd generation iPad was much like the 2nd except it was more graphic & updated. It also offers 4G compatibility.
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The 4th iPad was really an unveiling of the iPad mini. The 4th iPad also charged more faster than any other iPad that was made.
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The iPad Air jump to a 64-bit processor was initially dismissed as more of a marketing ploy. The iPad air is twice as powerful as the iPad 4.
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The iPad Air 2 is powered by Apple's first triple-core processor, making it significantly faster than the iPhone 6. It also upgrades the internal memory used to run apps from 1 GB to 2 GB.
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The iPad Pro is a super-sized and super-charged iPad. The 12-9-inch display towers over the 9.7-inch iPad air, and it makes the 7.9-inch iPad Mini look like an iPad Tiny.