Why is it important to be a critical viewer of advertisements?

Advertisements are produced to persuade the audience to buy something. They don't always tell the whole story.

Ads are made to sell products, and the advertiser will say whatever is necessary in order to get you to buy it. Sometimes, what they are saying is not totally true. You have to analyze their statements to see if they ring true so you are buying the best products for yourself, and not a lot of things you don't need.