Imagine yourself walking into a pizzeria to buy a delicious pizza.

A pizzeria sells *many kinds of pizzas.*

and serves for each kind *three different sizes* (small-medium-large)

To remember all these data , the owner arranged kinds , sizes and prices in a respective way in a table (or The Menu)** **.

In this case, the menu is our *matrix.*

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In mathematics, a *matrix *(plural matrices) is a rectangular array of numbers, symbols, or expressions, arranged in **rows** and **columns.**

- The size of a matrix is defined by the number of rows and columns that it contains. A matrix with
and*m*rowsis called an*n*columns*m*×*n matrix.* - while
*m**n**dimensions*.

The dimensions of the following matrix are 3x3 because there are three rows and three columns.

*N.B: *

*i**describes the number of the row**j**describes the number of the column*

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