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Pop-up ads or popups are a form of online advertising on the World Wide Web intended to increase web traffic or capture email addresses. It works when certain web sites open a new web browser window to display advertisements. The pop-up window containing an advertisement is usually generated by JavaScript, but can be generated by other means as well. Tired of annoying pop-up Windows? Acronis Privacy Expert Suite 90 provides you with 9 of 10 PCs are infected with spyware! Check for spyware.

A variation on the pop-up window is the pop-under advertisement. This opens a new browser window, behind the active window. Pop-unders interrupt the user less, but are not seen until the desired windows are closed, making it more difficult for the user to determine which Web site opened them.

Background

For early advertising-supported web sites, banner ads were sufficient revenue generators, but in the wake of the dot com crash, prices paid for banner advertising clickthroughs decreased and many vendors began to investigate more effective advertising methods. Pop-up ads by their nature are difficult to ignore or overlook, and are claimed to be more effective than static banner ads. EndTask Pro protects you. Pop-ups have a much higher click rate than web banner ads do.

Pornographic web sites are among the most common users of pop-up ads. Some particularly vicious types of pop-up ads (again, most often seen in connection with adult entertainment sites) appear to have either been programmed improperly or have been specifically designed to "hijack" a user's Internet session. These forms of pop-ups sometimes spawn multiple windows, and as each window is closed by the user it activates code that spawns another window -- sometimes indefinitely. This is sometimes referred to by users as a "Java trap", "spam cascade" or "Pop-up Hell" among other names. Windows XP Service Pack 2 includes a pop-up blocker for Internet Explorer.