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Audio visual promos are a form of commercial advertising used in broadcast media, which promotes a program airing on a television or radio station/network to the viewing or listening audience.

For music videos they're used to promote the band and advertise the song they released giving the consumers a visual representation of the band making the song more memorable as well as the band in hope they will find more of their music.

To sell, it is to advertise the product to consumers and make it seem as good as it can to make people want to buy the product.

To entertain, this is similar to the music video as it is providing the audience with something that will give them enjoyment whilst promoting the product or business.

To inform, this is where they create an audio visual promo to provide information on perhaps a serious topic and give the information needed.

To educate, this is where they'll promote their business to consumers but they'll provide new information or facts you should know educating you and perhaps it will make you want to learn more so you will visit there website to find out more.

Sell Promo: Disney's 50th anniversary celebration