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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