Note that many websites have their own advertising, unrelated to adware.
Adware is any software application in which advertising is displayed while the program is running. The authors of these applications include additional code that delivers the ads, which can be viewed through pop-up windows or through a bar that appears on a computer screen and sometimes through text links or in integrated search results. Adware may or may not track personal information. It may also gather information anonymously or in aggregate only. Users should check the EULA and Privacy policy to ensure if the adware on their machines conforms to their standards.
Official
Description:
From enConfidence, Inc.,
"The enConfidence Network is an in-context behavioral advertising network using software applications. These software applications are free to the public. In order to keep these applications free, pop up ads, based on your online behavior, will occasionally appear on your computer screen. Ad-free versions of these software titles will soon be available for purchase.
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We collect information regarding your Web surfing habits so that we can target advertisements and promotions that may be of the most interest to you.Please note that search query information collected by the Enconfidence Software is generally maintained by us on an aggregated basis (i.e., together with the queries of all of our end-users) for the purposes of generating statistics regarding the use of the Enconfidence Software (such as the number of queries performed by the average end-user per month, a list of the most popular query terms, etc.), and is never used in a manner that associates specific search query information with other information that would enable us to identify you, as we do not obtain or maintain any personally identifying information"
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