The Missing Link: Why Are Linked Lists useful in software? The concept of a Linked List has at least two things: It has a belongings (data) it has pointers to other storage units (next) It can tell us were the next storage unit (doubly linked lists have a map to the previous storage unit as well) There are many ways to implement this but lets code it out in ruby. We have a class StorageUnit which we will use as a node in our linked list. To be a true linked list each unit will have to know about the next unit.