Animation Schemes are new in PowerPoint 2003
Animation schemes applied to a PowerPoint slide show give a unified look to the whole presentation. By choosing an animation scheme, rather than individual animations applied to each slide, you can spend more time on content and presentation and let PowerPoint take care of the animations. Select the slide(s) you want to apply the animation scheme to in the Outline / Slides task pane at the left of the screen.
Related - Where Do I Find Animation Schemes in PowerPoint 2007?
