This is your main control panel in Excel. You should therefore be fully informed about this. So we’ll give you some more details.
The column header of the tablesheet indicates the different columns designated by letters (e.g. A, B, C, AA, AB, etc.). In total, there are 256 columns per sheet. Clicking on the column header marks the entire column.
The row header of the tablesheet denotes the various rows that are consecutively numbered (e.g. 1,2,8, 55, 698, etc.) A worksheet contains 65536 lines. Clicking on the line header marks the entire line.
The intersection of a column with a row is called a cell and is denoted by a combination of letters and numbers, e.g. A1, C2, F55, AG89/, etc.