A slide show or slide presentation is a series of pictures or pages of information, often displayed on a large screen using a video projector. The first slide shows were done with pictures on pieces of glass, to be later replaced photographic film slides in the 1940s. As the technology improved, overhead projectors began to be used to project a picture on a screen and the slides were made with transparent slide media, about the size of a piece of paper. Printers could print text and images on this media or dry-erase markers could be used to write and draw on the media.
For today's presentations and showing slides, a slide in a slide show is essentially a single screen of information, able to display text, charts, and images. A slide can also feature various transitions, which are added effects to enhance the slide and provide different viewing styles. Transitions can include words fading in or out of view, words sliding in to view from the left, right, top or bottom of the slide, as well as others. Slide-based presentations are a popular choice for business meetings, due to the ease of creating each slide and attention they can grab from viewers when done correctly.
Simple to complex designs can be created with Microsoft PowerPoint and the presentations can be built with as many slides as necessary. Google Docs also offers a presentation application, allowing multiple people to work on the presentation in a collaborative effort. A number of other applications are available for creating slides and presentations, including applications from Adobe and IBM. After completed slide shows are usually shown on a projector or TV. Slide shows can even be copied onto a DVD disc and played in a standard DVD player instead of through a computer.