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These provides reminders just stating what the product is and reminding you that the product is still available.

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After you sign up for something they can send you notifications for their products. Which allows you to have better chances of going there if you have a discount.

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Its comparing Pepsi and Coke. Its advertising them to get people to either change their minds or try both.

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It uses marketing to support a particular message or cause.  Uses public communication that influences public.

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It doesn't try to sell you anything directly. It provides a picture to just show you that its there. It also promotes an industry or institution rather than product or service.

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It advertises new products. It allows you to see the newest inventions and how they have came along from product to product.