[Please: What is the difference? Both diagrams below are Venn diagrams; one is asserted also to be an Euler diagram.]
The Venn diagram above can be interpreted as "set A and set B have some (but not all) elements in common".
The Euler diagram above can be interpreted as "set A is a proper subset of set B, but set C has no elements in common with set B.
Or, as a syllogism
Functionally, Venn, Johnston, and Euler diagrams are identical, though some sources argue for their distinctness in original purpose. It is likely that the Venn and Euler versions have not been "merged" because Euler's version came 100 years earlier, and Euler has credit for enough accomplishment already, whereas John Venn has nothing left to his name but the diagram.
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