There are two types of multidimensional arrays, jagged and true multidimensional arrays.
Jagged arrays
Jagged arrays are the arrays you will probably use the most. These types of arrays are very cost effective because the dimensions can be different in size.
$array = @(1, 2, (1, 2, 3), 3, 4, (10, 11, 12), 5)
$array[0]
$array[1]
$array[2]
$array[2][0]
$array[2][1]
$array[5]
Result:
1
2
1
2
3
1
2
10
11
12
True multidimensional arrays
With true multidimensional arrays can be compared to a matrix. You define the size of the array/matrix when you create it.
$array = New-Object 'object[,]' 5,8
$array[2,5] = 'Hello'
$array[3,7] = 'World!'
$array
Result:
Hello
World!
You can compare the above with the following:
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[ ][ ][Hello][ ] [ ]
[ ][ ][ ] [ ] [ ]
[ ][ ][ ] [World][ ]