the processes for dehydrating and juicing are very different. With dehydration you are evaporating the water content away. With juicing you are typically pressing the liquids out of the fruit. Even a prune has to have some liquid content left otherwise it would be dust or a rock, so it can still be juiced to some extent.
At least in France pruneau (prune in English) are made from a specific kind of plum. [This one](https://fr.wikipedia.org/wiki/Prunier_d%27ente)
Others plums can be dried but don’t have the exact same taste, and [look very different](https://en.wikipedia.org/wiki/Prunus_domestica), bigger, smaller, red, yellow and usually round.
I say at least in France, because France is the origin of the prune (this word means plum in French, probably someone got confused when importing the fruit from France), prune are named pruneau here. And usually USA has the habit to industrialise and change traditional recipes to make them cheaper, so it’s possible you get prune juice in USA made from whatever (even apple).
Almost 60 years ago, in a Chicago Burb, two of our neighbors got in a feud over one guys plums, falling in the other guy’ s lawn. It escalated over weeks, into one guy taking a ladder and saw, started to cut the limbs off at the property line and throwing them on to the plum trees’ owners property, it got so bad the police had to come, the police told the Plum guy, he had to clean the other guys lawn if his plums fell on it, and the other guy had to let the Plum guy into his back yard, to trim the plum branches back and pick up any stray plums. It sounds a bit stupid, but it seemed to work, as just like major border conflicts all over the world, once reason takes control over emotion, or, once plums become much less of an issue, and the lawn guy finally admitted, i did like having an occasional plum, they are very tasty and sweet, the old neighborhood was calm and quiet once more.
There is some confusion about naming.
Commonly, in north america, Prune is the term for dried plums and plum refers to the fresh fruit. Americans were squeamish about the term “prune” because of the supposed connotation with them being laxative so the industry switched to “plum”, so prune is an obsolete term for plum. Prune juice, for whatever reason, didn’t get changed.
Prunus is the subgenus, of which plums are a member.
Also, the varietals of plum grown specifically for drying are called prunes.
Long story short, you’re drinking plum juice.
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