Lists and Arrays just store sequential data
We often have to deal with hierarchical data.
https://scrooge-mcduck.fandom.com/wiki/Don_Rosa%27s_Duck_Family_Tree
https://www.ckmmphotographic.ca/wordpress/file-structure-for-editing/
https://www.thecolumbiasciencereview.com/blog/dinosaurs-reclassified
Today, it’s all about
