Final answer:
In presentations, pushing one slide off while another appears is a transition, which is the effect between slides as opposed to animations within a slide.
Step-by-step explanation:
When giving a presentation, pushing one slide off the right edge of the screen as another one appears is an example of a transition. In presentation software, a transition refers to the visual effect that occurs when you move from one slide to the next. This is different from an animation, which applies to elements within a single slide, and an entrance or exit, which are specific types of animations that make an element appear on or disappear from a slide.