A hologram is a three-dimensional image that is created using a laser and a holographic medium. The image appears to be suspended in space and can be viewed from any angle. Holograms are created by recording the interference pattern that is created when a laser beam is shone on an object and then split into two separate beams. One beam is directed at the object, while the other is directed at a holographic medium, such as a film or plate. The patterns that are recorded on the medium can then be used to reconstruct the original image when the medium is illuminated with a laser.

There are many different uses for holograms, including in art, education, and entertainment. Holographic displays are also used in a variety of fields, including medicine, engineering, and military applications. In recent years, there have been significant advances in holographic technology, leading to the development of new types of holograms, such as volumetric holograms and holographic video.