1. The purpose of such a cable or adapter is to facilitate charging- data transfer- or connectivity between the Lightning and devices equipped with a Micro USB port. This can be useful in situations where you need to connect your Lightning to a charger- computer- or peripheral device that only supports Micro USB. 2. The cable or adapter will typically have a Lightning connector on one end and a Micro USB connector on the other- allowing for seamless compatibility between the two different connector types. These adapters or cables can be found in various lengths and configurations to suit different needs and preferences.