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A central ad server is a computer server that stores advertisements and delivers them to web site visitors. These servers centrally store the ads so that advertisers and publishers can track from one source the distribution of their online advertisements, and have one location for controlling the rotation and distribution of their advertisements across the web.
Ad serving describes the technology and service that places advertisements on web sites. Ad serving technology companies provide software to web sites and advertisers to serve ads, count them, choose the ads that will make the web site or advertiser most money, and monitor progress of different advertising campaigns.
In computer science, and particularly in search engines, relevance is a numerical score assigned to a search result, representing how well the result meets the information need of the user that issued the search query. In many cases, a result's relevance determines the order in which it is presented to the user.
Permission marketing is a term used in e-marketing. Marketers will ask permission before they send advertisements to prospective customers. It is used by some Internet marketers, email marketers, and telephone marketers. It requires that people first "opt-in", rather than allowing people to "opt-out" only after the advertisements have been sent.
