The name of the poster originated in Shanghai. In the old days, posters were used for posters such as dramas, movies, and other events. People in Shanghai usually refer to professional drama performances as "sea", while performances in professional dramas are called "sea". The use of posters is generally divided into four categories: 1 advertising posters: can be spread to the society, mainly to enhance the visibility of enterprises or individuals. 2 Modern Social Posters: A more common social phenomenon that is accepted by a large number of people and provides important information about modern life. 3 Corporate Poster: Recognized by the corporate sector, he can use some of the ideas that control employees to trigger thinking. 4 Cultural propaganda poster: The so-called culture is indispensable in today's society. No matter how remote the corner, how quiet the mountains, there are cultural star posters.