Lightning is a proprietary computer bus and power connector created by Apple Inc. to replace its previous proprietary 30-pin dock connector, used to connect Apple mobile devices like iPhones, iPads and iPods to host computers, external monitors, cameras, USB battery chargers and other peripherals. Using eight pins instead of thirty, Lightning is significantly more compact than the 30-pin dock connector and can be inserted with either side facing up. However, it is incompatible with cables and peripherals designed for its predecessor, unless used with an adapter. It was introduced in 2012 and as of November 2014 is used by the iPhone 5 on wards, iPod Touch (5th generation), iPad (4th generation)on wards, iPad Mini and iPod Nano (7th generation).
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Source: ElectroDroid and Wikipedia