Visual language is a communication system that uses images to convey messages. It has several key elements, including shape, color, and texture. Images have both a signifier, which is the visual appearance, and a signified, which is the meaning or concept. There are different types of images like logos, icons, signs, signals, and symbols. Visual language serves four main functions: informative, aesthetic, expressive, and exhortative. The level of iconicity refers to how closely an image resembles reality, from highly iconic images like photographs to more abstract, less iconic images. Images can also be realistic, figurative, or abstract in their representation of reality.