Hoax is a label for an alarm or false message or information usually designed to trigger chain propagation, thus extending the alarm information to the greatest number of people. Hoaxes can be deceptive, alarming or it can just be a joke.
Hoax in practice: Hoax as an alarm message can be distributed in any medium (TV, radio, etc.), but it is nowadays spread very easily by using information technologies, especially through e-mail. Hoaxes often inform against existent dangerous virus, a malicious program or other threats, and challenges for further distribution and dissemination of this report. Hoax is a security threat with a low level of risk, the danger lies in the harassment, burdening IT infrastructure and the disclosure of email address.