Difference betn road & triathlon bikes?

Been to a bike shop recently. I saw on display triathlon bikes on 1 section & road bikes in another. They both look the same to me. Both have at least 10 - 12 speeds derailleurs, curved handle bars, hard seats, lightweight frames, tubular tyres etc. Also both bikes race/travel on roads. So whats the diff? Can... show more Been to a bike shop recently. I saw on display triathlon bikes on 1 section & road bikes in another.
They both look the same to me. Both have at least 10 - 12 speeds derailleurs, curved handle bars, hard seats, lightweight frames, tubular tyres etc. Also both bikes race/travel on roads.

So whats the diff? Can anyone use a triathlon bike for something like say the Tour De France.
Update: Road bikes seem to cost more than the triathlon ones
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