A jagged array is an array whose elements are arrays. It is recommended over a multidimensional array because the arrays that make up the elements can be of different sizes, which avoids wasting memory space.

Noncompliant Code Example

int [,] myArray =  // Noncompliant
    {
        {1,2,3,4},
        {5,6,7,0},
        {8,0,0,0},
        {9,0,0,0}
    };
// ...
myArray[1,1] = 0;

Compliant Solution

int[][] myArray =
    {
        new int[] {1,2,3,4},
        new int[] {5,6,7},
        new int[] {8},
        new int[] {9}
    };
// ...
myArray[1][1] = 0;