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Data structures are used to store information in our code. We use different data structures to allow us to add, access, and delete data in the most efficient and applicable ways to solve our problems. In interviews, choosing the right data structure could allow you to reduce the time complexity of your solution. Having a strong understanding of these data structures will ensure you can be successful in interviews. If I mention Big-O at any point in this article, I am referring to industry usage of the term (it is equivalent to Big-Theta in academia)