Visual communication
Visual communication was a form of communication which used visual elements to convey information, such as with pictures and video.

According to Commander Spock in 2268, during the Earth-Romulan War there was no ship-to-ship visual communication, therefor, no Human, Romulan, or ally had ever seen the other. ()

See also 
 Viewscreen
 Visual pickup

External link 
 

Communication