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USB: when would you need more than one interface?

Question asked by vu.andy on Sep 19, 2016
Latest reply on Sep 20, 2016 by Chinzei.Tsuneo
I've seen a lot of examples and almost all of them from STM have only a single interface.
And it seems like most of the time, one interface should be enough.
Since I am still learning USB, for those who have experiences with USB, when would there be a need for more than one interface?
For example, if I am building a HID Audio device, does it need more than one interface? 
Thanks.

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