This document provides an introduction to data structures. It defines data structures as the logical organization of data storage and the relationships between data elements. Data structures allow for efficient data access and include primitive structures like integers and characters as well as nonprimitive structures like arrays, linked lists, queues, and trees. Different types of data structures are suited to different applications. The document outlines common linear and non-linear data structures and basic operations on data structures like insertion, deletion, traversal, search, and sorting.