What is Jagged Arrays in C# ?

using System;
using System.Collections;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using System.Net;

namespace AbundantCode
{
    internal class Program
    {
        // What is Jagged Arrays in C# ?
        private static void Main(string[] args)
        {
            int[] array1 = { 10, 45, 734 };
            int[] array2 = { 986, 233, 233 };
            int[][] MainArray = new int[2][];
            MainArray[0] = array1;
            MainArray[1] = array2;

            foreach (var item in MainArray[0])
                Console.WriteLine(item);
            Console.ReadLine();
        }

    }
}