Definition talk:Venn Diagram

I'm curious as to what the so-called "a technique for the graphic depiction" is. Because sets are already fundamental, and shouldn't "diagrams" such as Venn diagrams be based on topology which is set-based?--AuroraAeon (talk) 09:50, 1 October 2022 (UTC)
 * Yes, Venn diagram is informal. This cannot be a proof of something. But it is very helpful to draw such a diagram while I am thinking. --Usagiop (talk) 13:38, 1 October 2022 (UTC)