You need to arrange the objects on your slides in a visually meaningful way so that others can understand your presentation. PowerPoint's AutoLayout feature helps you arrange objects on your slide in a consistent manner. When you create a new slide, you can apply one of the AutoLayouts. You can also apply an AutoLayout to an existing slide at any time. When you change a slide's AutoLayout, you keep the existing information. PowerPoint applies the new AutoLayout, and you can arrange the placeholders the way you want them.
Insert a New Slide
Apply an AutoLayout to an Existing Slide
Enter Information in a Placeholder