Export DataGridView to Excel File VB.NET

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VB

MS-Excel

DataGridView

Hi
I found this code: How to export datagridview to excel using vb.net?

I was wondering if someone could explain me this code:

Dim xlApp As Microsoft.Office.Interop.Excel.Application
Dim xlWorkBook As Microsoft.Office.Interop.Excel.Workbook
Dim xlWorkSheet As Microsoft.Office.Interop.Excel.Worksheet
Dim misValue As Object = System.Reflection.Missing.Value
Dim i As Integer
Dim j As Integer

xlApp = New Microsoft.Office.Interop.Excel.ApplicationClass
xlWorkBook = xlApp.Workbooks.Add(misValue)
xlWorkSheet = xlWorkBook.Sheets("sheet1")

What is this "System.Reflection.Missing.Value"? Is this the datagridview? Where was the DataGridView initialized?

Or if you have another way in exporting the datagridview that would be pretty helpful.

Thanks.