[yunqa.de] AnsiString vs. WideString

Hello
I'm a semi-newbie Delphi newbie. I'm going through the samples to learn how to use DISQLite, and I noticed in "Demos\DISQLite3_StringGrid\DISQLite3_StringGrid_fMain.pas" the use of AnsiStrin and WideString: 

procedure TfrmStringGrid.btnUpdate_Click(Sender: TObject);
var
  s: AnsiString;
  SQL: WideString;
  Stmt: TDISQLite3Statement;
begin
  s := StringGrid.Cells[c, r];
if InputQuery('Update', Format('Enter new %s:', [ColumnNames[c]]), s) then begin 
      SQL := Format(UpdateSql, [ColumnNames[c]]);

Is there a reason for using both data types?

Thank you.

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