Sub AdvancedVLookUpAnalysis()
    Dim wsSource As Worksheet
    Dim wsAnalysis As Worksheet
    Dim sourceTable As Range, targetTable As Range, col As Range
    Dim numRows As Long, numCols As Long, colIndex As Long
    Dim sourceSheetName As String, analysisSheetName As String
    Dim selectedHeaders As Collection
    Dim paramName As String
    Dim matchCol As Range
    Dim i As Long
    Dim matchCount As Long, notMatchCount As Long
    
    On Error GoTo ErrorHandler

    ' Prompt user to select Source Table
    Set sourceTable = Application.InputBox("Select the Source Table for analysis", Type:=8)
    If sourceTable Is Nothing Then Exit Sub
    
    ' Set the source worksheet and sheet name
    Set wsSource = sourceTable.Worksheet
    sourceSheetName = wsSource.Name
    analysisSheetName = sourceSheetName & "_VLookUp"
    
    ' Prompt user to select Target Table
    Set targetTable = Application.InputBox("Select the Target Table for matching", Type:=8)
    If targetTable Is Nothing Then Exit Sub

    ' Ensure selected ranges are valid tables
    If sourceTable.Rows.Count < 2 Or targetTable.Rows.Count < 2 Then
        MsgBox "Both Source and Target tables must have headers and at least one row of data.", vbExclamation
        Exit Sub
    End If

    ' Prompt user to select columns to match
    Set selectedHeaders = New Collection
    For Each col In targetTable.Rows(1).Cells
        If col.Value <> "" Then
            If MsgBox("Do you want to match by column: " & col.Value & "?", vbYesNo) = vbYes Then
                selectedHeaders.Add col.Value
            End If
        End If
    Next col

    If selectedHeaders.Count = 0 Then
        MsgBox "No columns selected for matching.", vbExclamation
        Exit Sub
    End If

    ' Check if analysis sheet exists; if so, refresh it
    On Error Resume Next
    Set wsAnalysis = wsSource.Parent.Worksheets(analysisSheetName)
    On Error GoTo ErrorHandler

    If wsAnalysis Is Nothing Then
        ' If sheet does not exist, create it in the same workbook, next to the source sheet
        Set wsAnalysis = wsSource.Parent.Worksheets.Add(After:=wsSource)
        wsAnalysis.Name = analysisSheetName
    Else
        ' Clear existing data for refresh
        wsAnalysis.Cells.Clear
    End If

    ' Ensure the sheet is visible
    wsAnalysis.Visible = xlSheetVisible
    wsAnalysis.Activate

    ' Copy source table to analysis sheet
    sourceTable.Copy Destination:=wsAnalysis.Range("A1")
    
    ' Determine number of rows and columns in source table
    numRows = sourceTable.Rows.Count
    numCols = sourceTable.Columns.Count

    ' Add matched columns and perform VLOOKUPs for each selected header
    For i = 1 To selectedHeaders.Count
        paramName = selectedHeaders(i)
        
        ' Find the corresponding column in the source table
        colIndex = Application.Match(paramName, wsAnalysis.Rows(1), 0)
        If IsError(colIndex) Then
            MsgBox "Column '" & paramName & "' not found in Source Table.", vbExclamation
            Exit Sub
        End If

        ' Add a new column for VLOOKUP results
        wsAnalysis.Cells(1, numCols + i).Value = paramName & " VLook_UP"
        Set matchCol = wsAnalysis.Range(wsAnalysis.Cells(2, numCols + i), wsAnalysis.Cells(numRows, numCols + i))
        
        ' Perform VLOOKUP
        matchCount = 0
        notMatchCount = 0
        For Each col In matchCol.Cells
            If Not IsError(Application.VLookup(wsAnalysis.Cells(col.Row, colIndex).Value, targetTable, 1, False)) Then
                col.Value = "Matched"
                matchCount = matchCount + 1
            Else
                col.Value = "Not Matched"
                notMatchCount = notMatchCount + 1
            End If
        Next col

        ' Generate summary table
        With wsAnalysis
            .Cells(1, numCols + selectedHeaders.Count + 2 + (i - 1) * 3).Value = "Result of " & paramName & " Matched"
            .Cells(2, numCols + selectedHeaders.Count + 2 + (i - 1) * 3).Value = "Matched"
            .Cells(3, numCols + selectedHeaders.Count + 2 + (i - 1) * 3).Value = "Not Matched"
            .Cells(4, numCols + selectedHeaders.Count + 2 + (i - 1) * 3).Value = "Total"
            .Cells(2, numCols + selectedHeaders.Count + 3 + (i - 1) * 3).Value = matchCount
            .Cells(3, numCols + selectedHeaders.Count + 3 + (i - 1) * 3).Value = notMatchCount
            .Cells(4, numCols + selectedHeaders.Count + 3 + (i - 1) * 3).Value = matchCount + notMatchCount
        End With
    Next i

    ' Confirm completion and reveal the sheet
    wsAnalysis.Visible = xlSheetVisible
    wsAnalysis.Select
    MsgBox "Analysis completed and results stored in sheet: " & analysisSheetName, vbInformation
    Exit Sub

ErrorHandler:
    MsgBox "An error occurred: " & Err.Description, vbCritical
End Sub
  what this code will do ?