What is USB to USB used for?
you could use it to transfer data between two devices.
Maybe you are interested in this post 5 Effective Methods to Speed up USB Transfer in Windows 10/8/7.

It is fully compatible with USB 1.0,1.1 and the cable length is 25Ft / 8M.
What Uses Can USB pop in A Male to pop in A Male Cable Be Put to?
This end should be marked because it causes OTG equipment to change to host mode.

gadget-only equipment like a printer should ignore pin 4.
USB-C to USB Adapter
Macs cannot technically connect to one another via a USB cable.
The USB-C to USB adapter is one of the USB to USB cables.
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Apple Company carries the LaCie USB-C drive which is used for Mack to its lineup.
And this post will show more detailed information.
Final Words
Its time to make a conclusion.
You have known what USB to USB is and what it is used for.