Transitions determine how you get from slide A to slide B. Back in the old slide projector days, there was only one transition: the old slide was pushed out, and the new slide dropped into place. However, with a computerized presentation, you can choose from all kinds of fun transitions, including wipes, blinds, fly-ins, and much more. These transitions are almost exactly like the animations, except that they apply to the whole slide (or at least the background—the base part of the slide—if the slide’s objects are separately animated).
The transition effect for a slide refers to how the slide enters, and not how it exits. As a result, if you want to assign a particular transition while moving from slide 1 to slide 2, you would assign the transition effect to slide 2.
The individual transitions are hard to describe in words; it is best if you just view them onscreen to understand what each one does. You should try out several transitions before making your final selection.
Generally speaking, if there is a live person controlling and presenting the show, transitions should be manual. With manual transitions, the presenter must click the mouse to move to the next slide, just like clicking the advance button on a 35mm slide projector. This might sound distracting, but it helps the speaker to maintain control of the show. If someone in the audience asks a question or wants to make a comment, the show does not ...