Usually they charge by keyword: for example, if you have the keyword "plastic surgery", and then you buy it from Google to promote it to you, the first price is about once in 30 yuan; The second place is cheaper and so on.
Because many businesses compete for high prices for such keywords, you can buy those remote and unpopular keywords at a lower price. After buying them, Google can put your website link on the promotion link.
Let's take the keyword "plastic surgery" as an example. Only when a netizen searches for "plastic surgery", and then Google puts your website on the promotion link, and the netizen clicks it, Google will charge you. If you search for other keywords such as "micro-shaping" and click, there is no charge.
Too much nonsense, in fact, depends on what keywords you need. This keyword is popular or not, and it is expensive ~ ~ But for your unique keywords, such as "xx Hotel, xx Hospital", it is very cheap. As long as you buy it, you can click once for 4 yuan ~ ~