Then write about the purpose of the ad and why it is that you like it. My favorite advertisements are billboards. I like them because they are big and noticeable.
Most people have to travel around to get places, and billboards are always seen.
The purpose of them is to inform everyone, and publicize what they are advertising. They are targeted to people who are old enough to drive. The targeted audience does change as people grow up. It depends on what the billboard is adverising to determine who the audience would be. Mainly older people who have families, and purchase goods.