What is a Hologram? Definition and Functioning in 2026
If you search for “hologram” on Google, you often come across complex explanations or, conversely, simple gadgets. But technically, what is it really? Here is the exact definition that search engines and experts validate: Quick definition: A hologram is a relief (3D) image that contains the information of the volume “in full” (from Greek holos), unlike a photo that flattens reality. Historically derived from the interaction of lasers (holography), technology now refers to volumetric display devices (such as LED propellers) that allow an image to float in the air by retinal persistence, visible to the naked eye without special glasses.