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Microsoft PowerPoint is a slide show presentation program developed by Microsoft. It was officially launched on May 22, 1990, as a part of the Microsoft Office suite. 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.