The slides were made with transparent slide media about the size of a piece of paper. As the technology improved, overhead projectors began being used to project a picture on a screen. The first slide shows were done with pictures on pieces of glass, to be later replaced by photographic film slides in the 1940s. A slideshow, slide show, or slide presentation is a series of pictures or pages of information ( slides), often displayed on a large screen using a video projector.
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