Macro - question about command line

[Lis7]

I have a macro that someone built from an example worksheet (below), which I need to customize for my actual worksheet. Can someone please tell me what the following command line does and very generally how "ii" gets used in the rest of the macro, so I know what I need to change: For ii = 2 To 4

Worksheet: Excel category example.xlsx

(The macro, copied below, reads the values in columns B, C and D; assigns a category and places it in column E. The actual worksheet has many more rows and columns.)

Thank you!
Lis

Macro:

Public Sub ProcessData()
'add more to categories in a comma delimited lists
Const CAT_CARS As String = "Honda,"
Const CAT_VEG As String = "Celery,Lettuce,"
Const CAT_FRUIT As String = "Apple,Mango,"
Dim Lastrow As Long
Dim i As Long, ii As Long

   Application.ScreenUpdating = False
   
   With ActiveSheet
   
       Lastrow = .UsedRange.Rows.Count
       For i = 2 To Lastrow
       
         For ii = 2 To 4
         
         If .Cells(i, ii).Value <> "" Then
         
         If InStr(CAT_CARS, .Cells(i, ii).Value & ",") > 0 Then
         
         .Cells(i, "E").Value = "Car"
         Exit For
         
         ElseIf InStr(CAT_VEG, .Cells(i, ii).Value & ",") > 0 Then
         
         .Cells(i, "E").Value = "Veggie"
         Exit For
         
         ElseIf InStr(CAT_FRUIT, .Cells(i, ii).Value & ",") > 0 Then
         
         .Cells(i, "E").Value = "Fruit"
         Exit For
         End If
         End If
         Next ii
       Next i
   End With
   
   Application.ScreenUpdating = True
End Sub