Both popups and popunders are types of advertising. Popups are small windows displayed on the top of the webpage where as popunders are displayed beneath the web page. Popups are generally developed using the java script. Most of the browsers have an inbuilt option of blocking the popups from the websites. If the user is getting annoyed by the shoot up of the popups, the option can be used to block the popups. Blocking popunders is also possible but in the advanced browsers. Since popunders are displayed behind the webpage, the chances for the user to get annoyed would be less as the user has not been stopped from viewing the contents of the page . pounder advertising in the website Europe Web Traffic starts at $3 providing the customers with a variety of options on size of the popunder and targeting options. The adunits include a full page and other custom sizes which one can use to their creativity and attract more customers in terms of traffic to their site. The user can now choose from the options to have a full screen popunder or have a shorter window. The custom sizes include 800 X 300, 160 X 600 and 300 X 250. The user needs to provide targeting options such as frequency capping, keyword targeting and many more.