Search Engine Friendly URLs
On today’s Internet, database driven or dynamic sites are very popular. Unfortunately the easiest way to pass information between your pages is with a query string. In case you don’t know what a query string is, its a string of information tacked onto the end of a URL after a question mark.
So, what’s the problem with that? Well, most search engines (with a few exceptions - namely Google) will not index any pages that have a question mark or other character (like an ampersand or equals sign) in the URL. So all of those popular dynamic sites out there aren’t being indexed - and what good is a site if no one can find it?
The solution? Search engine friendly URLs. There are a few popular ways to pass information to your pages without the use of a query string, so that search engines will still index those individual pages. Ill cover 3 of these techniques in this article. All 3 work in PHP with Apache on Linux (and while they may work in other scenarios, I cannot confirm that they do).
(taken from: http://www.sitepoint.com/article/search-engine-friendly-urls )
Method 2 of SEF
Method 1 of SEF
Method 3 of SEF
Search Engine Friendly
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