NoFollow

A tag used to stop search engines parsing on PageRank to sites linked to the host site

PFI

Abbreviation for Pay For Inclusion. Many search engines offer a PFI program to assure frequent spidering / indexing of a site (or page). PFI does not guarantee that a site will be ranked highly (or at all) for a given search term. It just offers webmasters the opportunity to quickly incorporate changes to a site into a search engine's index. This can be useful for experimenting with tweaking a site and judging the resultant effects on the rankings

Link popularity

Search engines often use link popularity as part of their ranking criterion. In simple terms, link popularity is the measurement of the number of other Web sites that include a link to your Web site on theirs. Each search engine, depending on their specific algorithms, determines it differently.

Manual submitting

Submitting by hand to an individual search engine, rather than using an automated submission tool or service. Manual submitting is the more polite way to submit, and as such is less likely to land you in trouble with the search engines. But the best approach is not to submit at all and let the search engine spiders find your site through links from other sites to your site

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Meta tags

A Meta Search Engine uses meta tags to determine a pages content and it’s relevancy. There are not a lot of successful Meta Search Engines still in use, as most search engines nowadays use the actual content of a page to determine it’s relevancy to certain keywords.