The cell that is in use.

Explanation: Highlighted cell: While highlighting can indicate the active cell, it can also be used to select multiple cells at once. Main cell: This isn't a standard term used in spreadsheets.Active cell: This is the most accurate term. The active cell is the currently selected cell where you can enter data or formulas. Its address is displayed in the formula bar at the top of the spreadsheet window.Formula cell: This term isn't wrong, but it's not as general. A formula cell is an active cell that contains a formula rather than just a value. Any active cell can become a formula cell by typing a formula into it.