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A Public service announcement or PSA is a short commercial-type message, often done by a celebrity, to explain or emphasize a point. The network or station transmitting the PSA does not received payment for the transmission, as opposed to a commercial or info-mercial.
During the fourth season of 24, Kiefer Sutherland appeared in a PSA, explaining that the day's events are fictitious and in no way suggestive of any real terrorist cells being formed by immigrant or naturalized Americans. This was in response to several groups public messages that Americans of Arab descent or appearance were being targeted for harassment due to the depictions of characters on 24.