USB Cables

I always thought they were 4-pin. +5V, GND, Data+ and Data- but I am seeing "5-pin". What is the 5th pin and when does it come in to play?

   I have also seen some described "with data transfer" almost as it it were something extra.......
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LockDown32OwnerAsked:
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John TsioumprisSoftware & Systems EngineerCommented:
I think you need to check this
The 5th pin is the ID and is used for identification
LockDown32OwnerAuthor Commented:
How about a little more detail? The normal USB 2.0 computer cables have the pinouts as I stated above. So the 5-pin is only applicable to the mini and micro? Are those cables 5-pin on the computer side? What is the ID used for?
John TsioumprisSoftware & Systems EngineerCommented:
Here you are.
The 5th pin defines the kind of device so one is the host and the other is the peripheral.

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nobusCommented:
>>   I have also seen some described "with data transfer  <<  that probably relates to usb battery chargers ( they don't have/need data - only power)
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