Holography is based on the principle of interference. Holograms capture the interference pattern between two or more beams of coherent laser light. Ahologram is a photographic recording of a light field. This is used to display a three-dimensional image of the holographic subject.
Holograms can be seen without the aid of special glasses such as the ones used for 3D or the headsets for Virtual Reality. Holographic projectors use holograms instead of graphic images to produce projected pictures. In Star Wars (video below), R2D2 was used as a holographic projector to project the hologram of Princess Leia.
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