Nature and human civilization are about collections. Families collect relatives, cities collect people acting together, houses collect people and their belongings, math set theory uses collections for relation formulas, galaxies collect stars, atoms collect elementary particles, and so on. It is thus no surprise that computer languages, intended to model real-world scenarios, must be able to model collections as well.
In the real world this is not such a big topic, but computers from the very beginning have drawn a sharp distinction between fixed-size collections and variable-size collections. ...
