Pay per click search engines are actually advertising directories and not search engines in the traditional sense, which deliver paid for sponsored search results as a response to end user search queries. For example, when an end user searches for the search term 'keyword research' the search results set would include the advertisers which purchased the term 'keyword research' and if the end user clicked on one of these results the advertiser would pay some type of fee to the search engine.

The pay per click advertising model is the largest (by market share) and fastest growing method of internet marketing.

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