PowerPoint presentations
consist of a number of individual pages or "slides". The
"slide" analogy is a reference to the slide
projector. A better analogy would be
the "foils" (or transparencies/plastic sheets) that are shown with an overhead projector, although they are in decline now. Slides may contain text,
graphics, sound, movies, and other objects, which may be arranged freely. The
presentation can be printed, displayed live on a computer, or navigated through
at the command of the presenter. For larger audiences the computer display is
often projected using a video
projector. Slides can also form the
basis of webcasts.
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