Linq with jagged arrays

I am trying to understand a piece of code but I am not sure I do. I will be very grateful if someone could explain to me what happens here:

foreach (var row in jaggedArray.Skip(1).OrderBy(r => r[headerIndex]))
{
    Console.WriteLine(string.Join(" | ", row));
}

I suggest that .Skip(1) misses the first row, but after that, I did not understand anything. I will give you an example of what this code does:

4
name, age, grade
Peter, 25, 5.00
George, 34, 6.00
Marry, 28, 5.49
sort name

This is an example input. Our jagged array has 4 rows and 3 columns. We have to sort the name header so in this case, the header index is equal to 0. Thank you advance!