Jagged arrays do not need to (but can) have a rectangular shape, which is what makes them jagged in the first place. In some situations, arrays have a more regular shape, making them amenable to the use of multidimensional arrays. A typical example is a Sudoku challenge, which has nine rows and nine columns:
byte[,] sudoku = new byte[9,9];
The number of dimensions is indicated by writing commas between the square brackets of the array type. When initializing the array, the size of the dimensions is specified. In this particular case, we have two dimensions, but more dimensions are allowed (creating cubes or hypercubes).