To improve the speed and efficiency of your drawing, you can view and snap to a rectangular grid. The grid is a rectangular dot or line pattern that extends over the specified area as the grid boundary. Using grid mode is like placing a sheet of graph paper under a drawing because it facilitates the alignment of objects and the display of the distance that separates them.
Snap mode limits pointer movements to user-defined intervals. When this mode is enabled, the cursor appears to adhere to an invisible rectangular grid. Snapping is particularly useful for specifying precise points using the pointing device.