Grid Settings Dialog Box
The Grid Settings dialog box displays the following items:
Show the Grid
Select this check box to shows a grid of evenly spaced dots to help you guide the placement of objects for precise vertical or horizontal alignment.
Snap to Grid
Select this check box to force the top left corner of every object you create or move to stick to the closest grid point.
Grid Interval
Specifies the amount of space, in pixels, between each evenly spaced dot in the grid.