Media Literacy is the use of literacy to sell or advertise a product or company.     

This ad shows a scene from a popular movie, and transforms it into a geico ad. Many people are familiar with Darth Vader and Emperor Palpatine. This makes them pay attention to them and read what they are saying. This is the testomonial teqnique.

  This ad is for McDonalds. The words and the salad makes people think " I want a salad" and they will go to McDonalds, because they saw the McDonalds sign on the board. This is the symbols technique.

this ad shows the walmart happyface. This makes people think "I think I should go to walmart, so I will be happy like the happy face".  Also, it might make people think that shopping at walmart is easy. This is the symbols technique.