Query in Result

Question

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

namespace HelperMethods

{

class Program

{

static void Main(string[] args)

{

Console.WriteLine("The Name Game");

Console.Write("What's your first name? ");

string firstName = Console.ReadLine();

Console.Write("What's your last name? ");

string lastName = Console.ReadLine();

Console.Write("In what city were you born?");

string city = Console.ReadLine();

char[] firstNameArray = firstName.ToCharArray();

Array.Reverse(firstNameArray);

char[] lastNameArray = lastName.ToCharArray();

Array.Reverse(lastNameArray);

char[] cityArray = city.ToCharArray();

Array.Reverse(cityArray);

string result = "";

foreach (char item in firstNameArray)

{

result += item;

}

result += " ";

foreach (char item in lastNameArray)

{

result += item;

}

result += " ";

foreach (char item in cityArray)

{

result += item;

}

Console.WriteLine("Results: " + result);

Console.ReadLine();

}

}

}

 

In the program above, what does  string result = ""; & result += item; & result += " "; do ? I dont understand what these do?