Association is a broad concept, which associates two classes, meaning they have somethings in common. It’s not quite the same as an Interface. Some further subtypes of association are
A good way to identify association is to see if there is any pointer reference to another class
A type of Class Relationship A link indicating one class contains an attribute that is itself a class.
Self-Association
#todo https://medium.com/@bindubc/association-aggregation-and-composition-in-oops-8d260854a446