SEO technique

From: Elixirsystems
Search engine optimization (SEO) is the process of analyzing your site and modifying it to enable search engines to read it, understand it and index (or catalog) it correctly. This is not rewriting the site or changing the look and feel. It is subtle changes, adding or modifying inconspicuous visible and invisible text so that the search engines can read the site. SEO is not 'spamming' the search engines - it is simply helping the search engines help you.
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From: Wikipedia
Search engine optimization (SEO) is the process of improving the volume and quality of traffic to a web site from search engines via "natural" ("organic" or "algorithmic") search results. Usually, the earlier a site is presented in the search results, or the higher it "ranks", the more searchers will visit that site. SEO can also target different kinds of search, including image search, local search, and industry-specific vertical search engines.

source:
SEO technique for educational purposes
http://www.freewebs.com/angellost8/seoontheweb.htm