I am new to programming and currently coding in VB.NET. I'm starting to grasp For Loops but 1 line of the following loop doesn't make sense to me? :    Dim answer As Integer
        Dim startNumber As Integer

        answer = 0

        For startNumber = 1 To 4

            answer = answer + startNumber

        Next startNumber

        MessageBox.Show(answer)
can someone explain the line that says " answer = answer + startNumber"