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Mass communication is manly used as a way to increase or get the most possible amount of exposure for a brand/ product among a common, standard audience.
On one hand it's usualy used to showcase a new launching of a certain brand/product, where it will ignite the spark in interested customers to gain their attention and motivate them to look up further details about the brand/product. On the other hand, it's used to keep showing people and reminding them that this brand/product is still in the market (Just like Coca Cola and Pepsi).