# Sets Summary

In this module, we introduced a new data structure, the Set. A set is a collection of values that does not contain any duplicate items. For simplicity, we showed an implementation of a set using a doubly linked list, but we could easily use an array to store a set as well.

Sets also include several unique operations, such as union, intersection, and difference. We looked at the pseudocode for some of these operations, but a few of them are left as exercises for us to complete in the project for this module.

While we rarely use sets in practice, the concepts we learned are instrumental in the development of more complex data storage techniques such as relational databases.