I believe advertisement is an essential part of companies, which help them sell more products. They can get more profit and earn more money. For example, Coca Cola, a global company still advertises to acquire new customer and maintain old customer. Advertisements today are really different from the past. In the past, companies mainly use TV or Newspaper to advertise. But for now, they use social media and internet. Advertisement's cost on these platforms are competitve and measurable. Esspecially today, using Facebook and Youtube advertisements are common methods to target young customers. Many clothes, cosmetic brands usually use these two channels to get more income.