when would you use a female to female lightning cable?

When would a female to female lightning cable be useful?


iPhone 5s, iOS 11.1.2, I also have an IPad 4
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Okay, you are right:)  I guess I don't know how to ask what I am wanting to know.  I have an iphone and an ipad which accept the male connector.  Why would I have two M-M cables?  What would they be used for other than for a place to attach two female cables

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