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TV advertising

From a child's point of view, what is the purpose of TV advertising? Is advertising on TV done to give actors the opportunity to take a or practice their lines? Or is it done to make people buy things? Furthermore, is the main between programs and commercials that commercials are for , whereas programs are not, or that programs are for kids and commercials for adults? As has been shown several times in the literature, some children are able to between programs and commercials and are aware of the intent of TV advertising, others are not.