The document discusses linear data structures like arrays, stacks, and queues. It defines them as structures where data is stored and accessed sequentially. Arrays allow direct access by index but have a fixed size. Stacks follow LIFO (last in, first out) using push and pop operations. Queues follow FIFO (first in, first out) using enqueue and dequeue operations. Examples of each are given like reversing a string using a stack. Pseudocode and C++ implementations of arrays, stacks, and queues are provided to demonstrate how to create and use the different data structures.