commercials

How  do commercials achieve there purpose? Well form what I've seen is that they use a lot of different tactics. Take a fast food commercial for example lets say its for burgers. They tend to show you a big delicious mouth watering burger with all the fixen. The freshest ingredients and and ice cold beverage. So I think that it draw people into buying there product. Even though that might not be the case when you get there.  Then you have the famous M&M commercials where they give the m&ms different characters. Although you know its just candy it makes you wanna buy.