Advertisers using these bid on "keywords", which can be words or phrases, and can include product model numbers. When a user searches for a particular word or phrase, the list of advertiser links appears in order of the amount bid. Keywords, also referred to as search terms, are the very heart of pay per click advertising. The terms are guarded as highly valued trade secrets by the advertisers, and many firms offer software or services to help advertisers develop keyword strategies. Content Match, will distribute the keyword ad to the search engine's partner sites and/or publishers that have distribution agreements with the search engine company.
As of 2007, notable Pay Per Click Keyword search engines include: Google Adwords, Yahoo! Search Marketing, Microsoft adCenter, Ask, LookSmart, Miva, Kanoodle, Yandex, and Baidu.
As of 2007, notable Pay Per Click Keyword search engines include: Google Adwords, Yahoo! Search Marketing, Microsoft adCenter, Ask, LookSmart, Miva, Kanoodle, Yandex, and Baidu.
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