In cybersecurity, the cognitive domain refers to the sphere where information, perception, and communication shape how individuals and groups think, form opinions, and make decisions. Threat actors may target the cognitive domain through misinformation, disinformation, or psychological operations to manipulate beliefs, influence behavior, or undermine trust in systems and institutions. Protecting the cognitive domain involves not only technical defenses but also educating users, promoting media literacy, and fostering critical thinking to help people recognize and resist manipulation. This domain is increasingly important as cyber threats evolve to exploit human psychology alongside technical vulnerabilities.