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<td width="20%">[[PHP and HTML Forms|Previous]]<td align="center">[[PHP Essentials|Table of Contents]]<td width="20%" align="right">[[Understanding PHP Sessions|Next]]</td>
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<td width="20%">PHP and HTML Forms<td align="center"><td width="20%" align="right">Understanding PHP Sessions</td>
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<google>BUY_PHP</google>
Web servers are typically stateless entities. That is to say they serve up web pages without regard to who requested the page and with no knowledge of whether that person has previously requested other pages. This makes it difficult for web based applications to track whether a visitor is new to the site or whether they have visited before and have already logged into a service. Cookies were developed to provide a mechism to track state in the otherwise stateless world of the web.
