Cookie
A cookie is an information package assigned to a client program (mostly a Web browser) by a server. The cookie is saved on your hard disk and is sent back each time this server is accessed. The cookie can contain various information: preferences for site access, identifying authorized users, or tracking visits.
In online advertising, cookies serve the purpose of changing advertising banners between visits, or identifying a particular direct marketing strategy based on a user's preferences and responses.
Advertising banners can be permanently eliminated from the screen by filtering software as offered by Naviscope or Webwash
Cookies are usually stored in a separate file of the browser, and can be erased or permanently deactivated, although many web sites require cookies to be active.
http://www.naviscope.com/
http://www.webwash.com/
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