The correct answer is 'A proprietary connector for charging and data transfer on Apple devices.' The Lightning port/connector is designed by Apple and is used for charging the device as well as transferring data. It is not universal, as it is specific to Apple's products, unlike USB-C, which is used across various devices from different manufacturers. When compared with a 30-pin dock connector and a USB Micro-B connector, it is evident that the USB Micro-B connector is common for many Android phones and other devices, while the 30-pin dock connector was the predecessor to the Lightning port and it is not the subject of the question.
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How does the Lightning connector compare to USB-C?