A program is written in order to solve a problem. A solution to a problem actually consists of two things:- A way to organize the data and Sequence of steps to solve the problem.The way data are organized in a computer's memory is said to be Data Structure and the sequence of computational steps to solve a problem is said to be an algorithm. Therefore, a program is nothing but data structures plus algorithms.Data Structure is simply a way to organize data. Data Structure can also refers to a collection of variables, possibly of different data types connected in various ways.