adware

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ad·ware

 (ăd′wâr′)
n.
Software downloaded from the internet that displays advertisements on personal computers, often without the user's permission.

adware

(ˈædˌwɛə)
n
1. (Computer Science) a type of computer software that collects information about a user's browsing patterns in order to display relevant advertisements in his or her Web browser
2. (Computer Science) computer software that is given to a user with advertisements already embedded
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Advertisements sold by Web search portals and Internet service providers include banner, popup, and popunder ads.