what is seo 1

search index or search engine
search index or engines are the predominant type of search tools you'll run across. originally, the term search engine referred to some kind of search index, a huge database containing information from individual websites. search index companies use software known as spiders or robots (or bots)which grab a significant amount of information and use complex algorithms.

search directories
a search directories is a categorized collection of information about web sites instead of containing information from web pages.
the most popular search directories are:
1. http://dir.yahoo.com
2. http://www.dmoz.org

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