Consider this scenario – you have a cell which contains a link to data in another cell on another sheet. The link might be the only thing in the cell or it might be a link in a formula which contains references to data in lots of other cells too.
If you want to go to a particular referenced cell you could read off the cell details – its sheet name and its cell reference and navigate there yourself or you could get smart and have Excel do the work.
To do this, click in the cell containing the reference and choose Formulas > Trace Precedents. When you do this you will see a small sheet icon and an arrow with a black arrow head pointing at the cell. Hold your mouse cursor over the arrow until the mouse cursor turns into a hollow white arrow. Double click and the Go To dialog will open. In it will be references to all the cells in the formula. Click the reference you are interested in going to and the cell reference will be highlighted – click Ok and Excel will take you direct to that cell.
If you have both workbooks open the same process will work to take you to a cell in another workbook if it is referred to in a formula in the current workbook.