Multidimensional arrays HELP!!

Question

how can using multidimensional arrays like [4][5] help? What can it do? How is it useful?
im really confused here please help with examples

Answer 1

[4][5] is 2 dimensional array
Where
[4] is row
[5] is column
Which is nothing but a 4*5 matrix

Ex [2]
This is one dimentional array

A three dimensional array looks like this examole below
[1][3][6]