Recurrence pattern: every year on November 30.

Computer Security Day is observed worldwide every November 30. Established in 1988, this day aims to highlight computer-related security issues, such as computer viruses and the importance of protecting personal data. Individuals and organizations celebrate by engaging in over 50 activities, including installing security updates, backing up data, and deleting unnecessary files. Various organizations, such as Security Awareness Incorporated and the Association for Computing Machinery, participate in this observance, providing resources and ideas for events. Although the official site for the project has not been updated since 2008, it remains a useful source for organizing celebrations related to computer security.