Hologram

A hologram was a construction of photons, force fields, and holomatter created inside a holodeck, a holosuite, or by another type of holographic projector. Holograms could be manipulated by advanced computer programs, allowing people to interact with the inanimate objects. Holograms can also be projected into space. Some highly advanced holoprograms, such as Emergency Medical Holographic programs, were even considered sentient beings in their own right; an example of this is USS Voyager (NCC-74656)'s Doctor (an EMH Mark I), who developed a personality distinct from his original programming. 

Rakelli
The Rakelli used holograms as fashion models and objects.

Romulan
Holograms were used as operatives by the Tal Shiar. Also, as was common for races with advanced holography, holodecks and holonovels were commonplace. 

Holograms

 * HOLIE
 * The Doctor (hologram)
 * Emergency Command Hologram
 * Emergency Medical Holographic program
 * Long-term Medical Holographic program