Multidimensional array has more than one dimension.

int[,] arr = new int[4,5]; //two dimentional array
int[,] arr = new int[,] {{2,3,4},{11,12,24}};
int elem = arr[0,0]; //elem=2
int elem2 = arr[1,1]; //elems=12

int num = arr.Length; //6

int dim = arr.Rank; //2

int len = arr.GetLength(1); //3