The Snap To Grid option helps you position objects accurately on a page. A grid is a set of lines to which the objects “stick” when the Snap To Grid feature is enabled. When you bring an object close to a grid line, the object snaps to the line much in the same way as iron sticks to a magnet. For example, you can stack objects accurately one above the other using a grid.
Select View > Show Grid. The grid is displayed as a matrix of dots on the slide.
Select View > Snap To Grid.
Select View > Snap To Object
Snap To Object is applicable only when you are drawing objects on a slide and not when you are editing or moving them. When both Snap To Grid and Snap To Object options are selected, the Snap To Object option takes precedence.