Why presta?

Weedylot

Angry Old Fart
I probably missed any discussion on this topic but, why do presta valves exist?(?) Is there an advantage to using them? What am I missing?
 
Thanks for the links Fairracing!
I suspected prestas were mostly used on skinny rims. I have one presta equipped tube on the Whizzer which means I now must carry or attach an adapter. I bent the dang ding dere when I first fumbled with it.:(
 
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