What is a Hologram/Holographic Projection?
Holographic projections or holograms are three-dimensional virtual displays and images that require diffraction of light. These 3D projections exist independently in space, and you can view them with the naked eye without using 3D glasses. Hence, this way, they are different from the usual forms and types of 3D images. Because they don't need any special external equipment or specific glasses for viewing purposes.
Holograms are photographic recordings of the light field instead of a lens image. Naturally, it means that the process of holography and the creation of these images requires a suitably lit area.