Some people like smart work instead of hard work. There are ad networks (mainly Google) spread across the web. Many websites use these ad networks to display ads. Digital marketers leverage these ad networks to show advertisements to potential buyers. You can also pay and make your websites appear on the first page of Google. The beautiful thing about using paid ads is - these ad networks take into account the location of the potential buyers, their interests, likes and dislikes. So your ads are shown only to those people who are more likely to buy from you.