Read the paragraph and answer the question. Advertisements want to persuade us to buy particular products.

Read the paragraph and answer the question. Advertisements want to persuade us to buy particular products. Advertisers study how people learn so that they can `teach` them to respond to their advertising. They want us to be interested, to try something, and then to do it again. These are the elements of learning: interest, experience and repetition. If an advert can achieve this, it is successful. If an advert works well, the same technique can be used to advertise different things. What is the main purpose of advertisements?