This document discusses different types of visual communication including images, symbols, signs, and more. It describes the purposes of images as informative, communicative, expressive, or aesthetic. Visual perception is defined as how the eyes and brain work together to interpret light and images. Principles of visual perception include figure-ground relationship, laws of good form, continuation, proximity, and similarity. The document also covers types of images such as still, moving, artistic, graphic design, digital, and those used in publicity and advertising.