A popup is an ad that is triggered as soon as the users clicks anywhere on the main page. This will open a new browser window appearing in front of the main page.
A popunder is an ad that's triggered when the users clicks anywhere on the page. It appears behind the main page he is visiting and is said "unoticed" untill main browser is closed.
A newtab is triggered when any user clicks on the main page. Appearing in a front position immediately the user's attenton on the advertisement.
A full page advertisement appears on the current web page which the user is visiting. This is an interesting way to capture the users attention on the advertisment.
A simple link integration which will present advertisement. This format is usually used by publishers who are ready to open the format and send the user to your direct link.