https://medium.com/achievers-tech/data-structures-and-algorithms-in-swift-arrays-c4ed2b44d238 > Data structures are the basic building blocks used in a system. They allow you to develop efficient, scalable, and maintainable systems. They also provide a means of organizing and representing data needing to be shared across different entities. Data structures not only make sharing data easier, but also make it easy to persist, sort, and search. > All software applications are based on data regardless of the type of system that you are developing. Most modern application developments use Application Programming Interfaces (APIs) to help them create amazing new products; however, these APIs still make use of their data structures and algorithms.