公益广告是以推广有利于社会的道德观念、行为规范和思想意识为目的,为公益行动、公益事业提供服务的广告传播活动。在灾难性事件发生时,公益广告在引导舆论、体现人文关怀、重塑信心和动员社会全体成员四个方面,行使协调功能,为公众、政府服务。 Public service ads are advertising campaigns that promote social ethics, codes of conduct and ideology for the purpose of public welfare activities and public welfare services. In the event of a catastrophic event, public service announcements exercise coordination functions and serve the public and the government in guiding public opinion, embracing humanistic concern, reshaping confidence and mobilizing all members of the community.