Slide transitions are the effects that take place when one slide gives way to the next one in the presentation, like Roll down from top or Fly in from left. They add dynamic flair to a slideshow, smoothing the transition between slides.

You can add transitions while in Slide Sorter view or in Normal view. To see the effect of a selection, you need to be in Normal view and select the Automatic preview checkbox on the Slide Transition page of the Tasks pane.

You can apply a single type of transition to all slides in the presentation or apply a different transition to any single slide, even having a different transition for every slide in the show. While using many different transitions may be fun to do, it may not give your show a professional appearance.

If you want most of the slides to have the same transition, but a few to be different, you may find it easiest to apply one transition to all slides and then change only the ones you want to be different.