You can show or hide gridlines and you can change grid and guide settings by choosing from a range of preset measurements.
In Excel 2007, the primary purpose of gridlines is to distinguish cell boundaries. Gridlines make it easier to align shapes and objects by giving you a visual cue in relation to the objects and the slide, document, or worksheet. And in Microsoft Office PowerPoint 2007, you can use drawing guides to position shapes and objects on slides. In Excel 2007, gridlines also make it easy to enter and find data in your worksheet. You can use gridlines to identify the center of your slide or document and position shapes and objects more precisely.