Application object: Returns a Sheets collection that represents all the worksheets in the active workbook. Read-only.
Workbook object: Returns a Sheets collection that represents all the worksheets in the specified workbook. Read-only.
For information about returning a single member of a collection, see Returning an Object from a Collection.
Remarks
Using this property without an object qualifier returns all the worksheets in the active workbook.
This property doesn’t return macro sheets; use the Excel4MacroSheets property or the Excel4IntlMacroSheets property to return those sheets.