Exposure: It can also be called touch exposure, that is, the customer opens the page and the page loads. Even if your advertisement appears at the bottom of the page, the customer does not scroll. It is also exposure. This is very easy to track because it relies on pure server data to calculate the number of demonstrations; Visible exposure: it means that when the advertisement of Amazon opening a store appears in the customer's visual range, it will be recorded and exposed once. If it is on a computer, as long as the advertisement appears on the screen, it is exposure. Without your advertisement at the bottom, customers won't scroll to the screen, which doesn't count.