ELI5 Sister Cities - are twin cities a gimmick or is there more to the relationship?

ELI5 Explain Like I'm 5: Bite sized answers to stuff you should know about - in a mini podcast

Which US city has a 4 block area nearly identical to its sister city of Seville, Spain? Are twin cities a gimmick or is there more to the relationship? Where did the concept start? What's the most boring sister city combo?

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Thank you to the r/explainlikeimfive community as always and in particular the following users whose questions and comments formed the basis of this discussion: conroybeckett, tardis98, snowlizzard, oliverthewanderer, thedankbank1021, kikob, peacewing, imgray & sagec_random12

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