Extrapersonal communication is communication between humans and non-human entities. It includes communication with animals through training, communication with plants through touch responses, and developing communication with robots and machines. As artificial intelligence advances, human-robot communication is increasing through voice assistants, robots that play video games, and robot secretaries that greet people and continue conversations. However, challenges remain as people may have inflated expectations of robots' knowledge and want them to display human-like emotions and opinions.