Transitions make moving between slides more visually interesting. You can easily apply the same transition to all slides, including the effects and options you've selected for that transition.
On the Transitions tab, under Transition to This Slide, click the transition that you want — Fade, for example.
To see more transitions, point to a transition, and then click .
To vary the transition, such as the direction it moves on the screen, click Effect Options, and then select the variation you want. Or, you can change other options such as duration, sound, or advancing the slide.
Under Apply To, click All Slides.