Holography is a technology; a hologram is its result. Holography records and reconstructs spatial information using the interference of light, and a hologram is the medium that reproduces the resulting three-dimensional image. The word comes from the Greek holos (whole) and gram (message).
How an optical hologram is made
An object is illuminated with laser light, and the interference pattern is recorded onto film. Like a photograph, the film is developed and kept; it can be viewed at any time without additional equipment, showing natural depth from many angles.
Analog and digital
An analog hologram is recorded directly from a real object. A digital hologram is created from 3D data, so it can show images that do not exist in reality.
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