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DEFINITION: Popups refer to secondary windows that open up automatically when a Web page is loaded. Sometimes, a variation, called a pop-under, occurs in which the secondary window opens behind the main Web page and may not be visible until the main window is dismissed.
Many popups are used as a delivery mechanism for advertising, whether you want it or not. As such, they tend to be more of an annoyance or a time-waster than a real hazard. Some popups come from unscrupulous sources, however, that promote material you might not want yourself or your family members to view -- such as pornographic content.
Popups may work in conjunction with "spyware" or "adware", automatically displaying targeted ads to you when you visit certain Web sites, based on the tracking that the spyware has done.
Note that some popups can legitimately enhance, or may be intended to enhance, your use of a particular Web site by popping up bits of information or instructions or other aids. Sometimes when you are filling out an online form, if you make a mistaken or erroneous entry, a small window may pop up, warning you of the problem and giving you a chance to correct it before proceeding. Unfortunately, popup blocking software can sometimes interfere with a legitimate function of this kind.
Another matter to be aware of is that some popup blocking software may not let you deliberately open a secondary window. So choose a solution that gives you control, allowing you to open desired secondary windows from trusted sites. Here is an article that can help you know the difference between "the good, the bad and the annoying."
Popup blocking software, often available as freeware downloads, abounds on the Web. See reputable sites like CNet's download.com or check our SafetyZONE listings. If you want to use this type of software, look for a program that allows a wide range of configurability and flexibility, and lets you easily disable it temporarily should the need arise.
