Cyberpsychology is the interdisciplinary study of the psychology of cyberspace and those who use the tools of cyberspace. This field identifies and explores the overlap between online and offline life through the application of psychological concepts and research. Key concepts that will be discussed briefly include cyber presence, digital identity, online disinhibition effect, digital deviance, dark personalities, and deception in cyberspace. Psychologically informed conceptualizations of cyber behavior may inform cybersecurity researchers, practitioners, and decision makers with insight about psychological motivations and vulnerabilities, and support better understanding of how to develop and implement effective cybersecurity tools, measures, policy and legislation.