What Do Underwires Do in a Bra?

Bra underwires support, shape and separate your bust, but how do they work? And how do you find a comfortable underwired bra?
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Underwired bras seem to be the Marmite of the lingerie world. But what do these love-'em-or-hate-'em wires do? You probably know that they play a role in adding support to the bra, but how do they do it?

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