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Contextual advertising



Many advertising networks display text-only ads that correspond to the keywords of an Internet search or to the content of the page on which the ad is shown. These ads are believed to have a greater chance of attracting a user, because they tend to share a similar context as the user's search query. For example, a search query for "flowers" might return an advertisement for a florist's website.


 


Another newer technique is embedding keyword hyperlinks in an article which are sponsored by an advertiser. When a user follows the link, they are sent to a sponsor's website.


Ads and malware

There is also class of advertising methods which may be considered unethical and perhaps even illegal. These include external applications which alter system settings (such as a browser's home page), spawn pop-ups, and insert advertisements into non-affiliated webpages.


 


Such applications are usually labeled as spyware or adware. They may mask their questionable activities by performing a simple service, such as displaying the weather or providing a search bar. Some programs are effectively trojans.


 


These applications are commonly designed so as to be difficult to remove or uninstall. The ever-increasing audience of online users, many of which are not computer-savy, frequently lack the knowledge and technical ability to protect themselves from these programs.


Creative Uses

Online advertising is not always sneaky. For instance, The Hunger Site uses online ads to generate revenue which is donated to charities that fight hunger. Altruistic site visitors willfully subject themselves to these ads by clicking, and the advertisers pay a certain rate based on the number of times their ads are viewed. This is an example of a Click-to-donate site.


 


In addition, the organization of information available online has given birth to the online directory.


Offline advertising

As online advertising has become more and more prevalent, and has taken a larger proportion of an advertiser's budget, the phrase, and concept of, offline advertising - i.e. any advertising not done online, has begun to get some traction. The phrase is generally used in the context of an advertising campaign that takes place on the web and through other media, that is a "cross-media" campaign.

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