Specific(exact) characters from char array to string C#

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I just saw in one sorce code something like this:

char[] letters = { 'k', 'n', 'p', 's' };

    for (int d1 = 0; d1 < letters.Length; d1++)
    {
        for (int d2 = 0; d2 < letters.Length; d2++)
        {
            for (int d3 = 0; d3 < letters.Length; d3++)
            {
                for (int d4 = 0; d4 < letters.Length; d4++)
                {
                    string left = ""+ letters[d1] + letters[d2] + letters[d3] + letters[d4];

What I am realy wondering is how exactly is that string strName = "" +.... what are these "" for? I looked wherever I could, but didnt find answer. Sorry if answer is very easy, I am new in programming, so I will appreciate your understanding.

asked 57 secs ago

Kadiyski

1

Specific(exact) characters from char array to string C#