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Presence, the experience of ‘being there’in a mediated environment, has become closely associated with VR and other advanced media. Different types of presence are discussed, including physical presence, social presence, and co-presence. Fidelity-based approaches to presence research emphasize the fact that as media become increasingly interactive, perceptually realistic, and immersive, the experience of presence becomes more convincing. In addition, the ecological-cultural approach is described, pointing out the importance of the possibility of action in mediated environments, as well as the role that a common cultural framework plays in engendering a sense of presence. In particular for multi-user or collaborative virtual environments (CVEs), processes of negotiation and community creation need to be supported by the CVE design to enable communication and the creation of a social context within the CVE.