that IS the simple explanation.
you have vocal cords in your throat. if you use them for a constant it is voiced, if you don’t its unvoised.
think of the difference between s and z. your tongue is in the same place doing the same thing in both sue and zoo, but z is voiced because you also use your vocal cords, where as s is unvoiced.
there are a lot of voiced unvoiced pairs like b/p, f/v and some sounds with out a single letter like the th in feather vs thumb
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