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For a target keyword that is too common or too competitive, it is a tricky job to do the rankings, even for experienced search-engine experts. In this case, you can consider using the PPC pay-per-click Advertising service provided by the search engine. For example, Overture's PPC advertising service, Google's AdWords keyword bid ranking services are PPC advertising service model.
The beauty of this approach is that only when users click on your ad links and visit your site will the cost be incurred, thus ensuring the high target of the access traffic that advertisers receive. Second, because the advertiser's Web site is based on the customer's bid on the keyword high and low decision order, so customers can adjust the price per click to control their own in a particular keyword search results ranking.
But Overture PPC is more expensive, especially for hot keywords. So advertising on the overture is usually a lot of deep pockets of the business, smaller sites can be carefully selected by a more specific target keyword to reduce advertising costs