Visual communication uses elements like symbols, signs, images, and gestures to convey messages. There are different types of visual elements that serve informative, communicative, expressive, or aesthetic purposes. The human visual system perceives images through the eyes and brain. Principles of visual perception like figure-ground relationship and law of good form help us organize visual information. Different kinds of images include still photographs, moving images like films, and artistic, graphic, digital, and advertising images. Mass media uses various visual advertisements to inform and influence consumers. Public service campaigns also use images to communicate important messages.