Paid inclusion is a practice followed by certain advertisers as per which a certain sum of money is paid to search engines in order to ensure that your pages are included in the search engine’s index, although there’s generally no confirmation on the ranking your page will receive. A prime example is Looksmart, which lists websites and pages based on relevance. Marketers and advertisers need to pay some fixed amount in order to be included in the index of the directory, on a per-URL fee or CPC basis.