The Improbable Origins of PowerPoint

With PowerPoint as well as its predecessors, the motif of the slide was, of course, lifted directly from the world of photography. Some presentation programs actually generated 35-mm slides for display with a slide projector. In most cases, though, the early programs created slides that were printed on paper for incorporation into reports, transferred to transparencies for use on overhead projectors, or saved as digital files to be displayed on computer monitors.