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Definition of a Public Service Announcement. A public service announcement (PSA) is an advertisement that a television or radio station airs for a cause or a charity. A PSA can tout the importance of medical check-ups for children or ask you to donate to the Salvation Army's bell ringers. Public service announcements are not paid advertising.
CDC public service announcement. A PSA from the CDC regarding H1N1 prevention. A public service announcement (PSA) or public service ad, are messages in the public interest disseminated by the media without charge, with the objective of raising awareness, changing public attitudes and behavior towards a social issue.