Some overall presentation changes-like customizing the theme fonts and theme colors-can be made quickly from the Design tab. Custom layouts can include your own background graphics and placeholders. When you adjust one of the layouts in Slide Master view, all of the slides with that layout will change.
For example, you could add a watermark or logo to each slide in your presentation, or you could modify the background graphics of an existing PowerPoint theme.
Modify backgrounds: Slide Master view makes it easy to customize the background for all of your slides at the same time.You could use Slide Master view to change just about anything in your presentation, but here are some of its most common uses. Whether you're making significant changes to your slides or just a few small tweaks, Slide Master view can help you create a consistent, professional presentation without a lot of effort.
