When you open an Excel sheet, what is the topmost bar called?

When you open an Excel sheet, what is the topmost bar called?

جب آپ ایکسل شیٹ کھولتے ہیں تو سب سے اوپر والے بار کو کیا کہتے ہیں؟
Explanation

When we open a new workbook in MS Excel, the Title bar appears on the topmost portion of the screen.

It displays the name of the open document.