A companion is defined as a person or object that helps, supports, or accompanies someone or something. In research, the study of companions often focuses on the role of animals, robots, or virtual entities in providing companionship and emotional support to humans. This research area explores the potential benefits of companionship for mental health, well-being, and social interaction, as well as the ethical considerations and implications of using non-human companions. Studies in this area may involve designing and testing companion robots, assessing the impact of animal-assisted therapy, or examining the effectiveness of virtual companions in reducing loneliness and improving quality of life. Overall, research in companionship aims to understand how these relationships can enhance human experiences and address various emotional and social needs.