Paid Inclusion

This is simply the practice of paying a search engine or a directory to add a site to its database immediately, rather than setting up that site so that it will be found by the search engine spiders on its own. In the case of some search engines and directories, paid inclusion is the only way to get listed. For others, it's presented as an option. If you're willing to pay, your site will be listed sooner. It's also a useful practice if you wish to make frequent changes to your content, because your site will be spidered more often and you will be able to test how changes affect your ranking.

Traditional Ads

This involves placing paid advertising on the search engine result pages (SERPs). Normally, these ads appear based on the keywords entered into the search engines, and one is charged based on the number of impressions, i.e. appearances, of the ad. In other words, you pay whether the ad sends anyone to your web site or not.
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