Behind every great PowerPoint presentation lurk masters that control the presentation's appearance: the Title Master, Slide Master, Notes Master, and Handouts Master. Each provides detailed formatting information for title slides, "regular" slides, speaker's notes, and hardcopy handouts, respectively.
These masters control many facets of the slides themselves—backgrounds, fonts (typeface, point sizes, colors, and the like), bullets, locations for all the main components, tabs, and indents. You can also use masters to specify pictures—a logo, for example—and "boilerplate" text that appears on all slides.
If you want to put a graphic, a piece of text, or any other type of object on a bunch of slides, ...