dvertisers try to persuade people to buy a product or service through various methods. A company may deliver an entertaining message about its product, compare the product to a similar item, list facts about the product, or make vague claims about the product which cannot be proved or disproved. This last method is known as "puffery" — the advertiser "puffs up" the product to seem like more than it is. Puffery is not illegal and is a common method used in advertising.