Visual communication involves communicating through visual means like images, gestures, and signs. It aims to gain attention, interest, desire, and action from viewers. There are various types and approaches to visual communication including graphic design, art, photography, multimedia, and illustration. Posters are an effective visual communication tool that can be used to educate, entertain, advertise, and make political statements. While visuals have benefits like being cost-effective, easy to understand, and persuasive, they also have limitations such as incomplete information, potential ambiguity, and not being suitable for all contexts.