Because it identifies the cell in the top left corner of the worksheet. By definition, this is called the Home Cell.
A1
Press Ctrl - Home.
It will bring you to cell A1 in the worksheet.It will bring you to cell A1 in the worksheet.It will bring you to cell A1 in the worksheet.It will bring you to cell A1 in the worksheet.It will bring you to cell A1 in the worksheet.It will bring you to cell A1 in the worksheet.It will bring you to cell A1 in the worksheet.It will bring you to cell A1 in the worksheet.It will bring you to cell A1 in the worksheet.It will bring you to cell A1 in the worksheet.It will bring you to cell A1 in the worksheet.
Ctrl-Home will bring you to cell A1 in a worksheet in Excel.
It will bring the cursor back to cell A1 and make it the active cell.
Ctrl+Home will bring you to the first cell, which is cell A1. Home will bring you to the first cell in the current row.
If you have a value in, for instance, cell A1 then if, for instance, you put =A1 in cell B1 then cell B1 will now contain a duplicate of cell A1.
While holding down the CTRL key, press HOME once ... Voila, back to cell A1. or Press F5 and then type A1 or any cell name like c1, c12, b2 etc... You can go to which cell you want in this way.
That depends on the version of Excel. Up to Excel 2003 it would be A1:IV65536. From Excel 2007 onwards it would be A1:XFD1048576.
A1 is the address of the first cell.
If you are referring to MS Excel, A1 represents the cell in the top left corner of a worksheet.
To format a cell in excel right click on it, then on the thing that pops up click on format cell