This document discusses different types of data structures, including linear and non-linear structures. Linear structures like arrays, stacks, queues, and linked lists store data in a linear order. Stacks follow LIFO while queues follow FIFO. Non-linear structures like trees and graphs store data in a non-linear fashion. Trees have a root node, child nodes, and terminal nodes. Graphs are sets of nodes connected by edges that can form connected or non-connected graphs.