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A projector is a output device that captures images created by a computer or Blu-ray player and reproduce them by projection onto a wall, screen or other surface. The surface that the projector is projected onto must be big, flat, and light colored. For instance, you can use a projector to show a presentation on a large screen so that everyone present can view it. Projectors can either produce static images (slides), or moving images (videos). They are typically similar to a small toaster and weigh only about a couple of pounds.