An online advertisement impression is a single appearance of an advertisement on a web page. Each time an advertisement loads onto a user's screen, the [[ad server]] may count that loading as one impression. However, the ad server may be programmed to exclude from the count certain nonqualifying activity such as a reload, internal user actions, and other events that the advertiser and ad serving company agreed to not count. For online advertising, the numbers of views can be a lot more precise. When a user requests a web page, the originating [[Server (computing)|server]] creates a log entry. Also, a [[wiktionary:third party|third party]] [[Web counter|tracker]] can be placed in the web page to verify how many accesses that page had. There are other advertising pricing structures, which are generally referred to as [[Cost Per Action]] (CPA) :
* [[Pay per lead|CPL]] - Cost per lead (lead usually meaning a free registration)
* [[ឌីស៊ីភីអឹម]] កំលាំង ស៊ីភីអឹម
* [[Pay per sale|CPS]] - Cost per sale
* [[dCPM]] - Dynamic CPM
CPI and/or Flat rate advertising deals are sometimes preferred by the publisher/webmaster because they will receive a more consistent fee proportional to the amount of traffic.