Each sheet will have its own active cell. You can move from one sheet to another by clicking on a sheet tab. Ctrl-Page Down and Ctrl-Page Up will move through the different sheets too. You can scroll up and down sheets without changing the active cell.
It is the cell selected at the current time. If you start typing, what you type will appear in that cell. Only one cell can be the active one, even when you have lots of cells selected. It will always be a different colour to other selected cells if others are selected.
the active cell
It is an operation that removes characters, cell contents, worksheets, or files.
Yes you can.
Yes, the active cell is outline in black.
active cell
At any moment in time, at least one cell has to be selected in Excel. It is known as the active cell. There has to be a focal point so that data or formulas can be typed in. Even when more than one cell is selected, there is only one active cell. Which cell is the active cell can be changed at any time, but there always has to be an active cell. If there isn't then, before you do anything, you would have to make a cell active. Cells are fundamental to Excel so there has to be an active cell at all times.
At any one time you can only be working on one cell in Excel, like when you are typing data. Even if you have many cells selected, only one can actually be used. That cell is the active cell. All other cells are inactive. So an inactive cell is any cell that is not the active cell.
If you select one cell, it will be active. However, if you select multiple cells at once, only one can be the active cell. That is usually the cell you select first.
cell contents
To format a cell in excel right click on it, then on the thing that pops up click on format cell
It could be called the current cell.