RSS（简易信息聚合，也叫聚合内容）是一种描述和同步网站内容的格式。RSS可以是以下三个解释的其中一个： Really Simple Syndication；RDF (Resource Description Framework) Site Summary； Rich Site Summary。但其实这三个解释都是指同一种Syndication的技术。RSS目前广泛用于网上新闻频道，blog和wiki。使用RSS订阅能更快地获取信息，网站提供RSS输出，有利于让用户获取网站内容的最新更新。网络用户可以在客户端借助于支持RSS的聚合工具软件，在不打开网站内容页面的情况下阅读支持RSS输出的网站内容。
从技术上来说一个RSS文件就是一段规范的XML数据，该文件一般以rss，xml或者rdf作为后缀，下面是一段 rss 文件的内容示例：
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xml version="1.0" encoding="utf-8"?>
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<code class="keyword" style="margin:0px !important;padding:0px !important;outline:0px !important;float:none !important;vertical-align:baseline !important;position:static !important;left:auto !important;top:auto !important;right:auto !important;bottom:auto !important;height:auto !important;width:auto !important;line-height:1.1em !important;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace !important;font-weight:bold !important;font-size:1em !important;min-height:auto !important;color:#006699 !important;background:none !important;">rss version="2.0">
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<code class="keyword" style="margin:0px !important;padding:0px !important;outline:0px !important;float:none !important;vertical-align:baseline !important;position:static !important;left:auto !important;top:auto !important;right:auto !important;bottom:auto !important;height:auto !important;width:auto !important;line-height:1.1em !important;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace !important;font-weight:bold !important;font-size:1em !important;min-height:auto !important;color:#006699 !important;background:none !important;">channel>
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<code class="keyword" style="margin:0px !important;padding:0px !important;outline:0px !important;float:none !important;vertical-align:baseline !important;position:static !important;left:auto !important;top:auto !important;right:auto !important;bottom:auto !important;height:auto !important;width:auto !important;line-height:1.1em !important;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace !important;font-weight:bold !important;font-size:1em !important;min-height:auto !important;color:#006699 !important;background:none !important;">title>php程序员教程网title>
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<code class="keyword" style="margin:0px !important;padding:0px !important;outline:0px !important;float:none !important;vertical-align:baseline !important;position:static !important;left:auto !important;top:auto !important;right:auto !important;bottom:auto !important;height:auto !important;width:auto !important;line-height:1.1em !important;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace !important;font-weight:bold !important;font-size:1em !important;min-height:auto !important;color:#006699 !important;background:none !important;">link><span style="color:#ff0000;">http://www.phpernote.com/</span>link>
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<code class="keyword" style="margin:0px !important;padding:0px !important;outline:0px !important;float:none !important;vertical-align:baseline !important;position:static !important;left:auto !important;top:auto !important;right:auto !important;bottom:auto !important;height:auto !important;width:auto !important;line-height:1.1em !important;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace !important;font-weight:bold !important;font-size:1em !important;min-height:auto !important;color:#006699 !important;background:none !important;">description>本站是一个php程序员的工作生活笔记!description>
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<code class="keyword" style="margin:0px !important;padding:0px !important;outline:0px !important;float:none !important;vertical-align:baseline !important;position:static !important;left:auto !important;top:auto !important;right:auto !important;bottom:auto !important;height:auto !important;width:auto !important;line-height:1.1em !important;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace !important;font-weight:bold !important;font-size:1em !important;min-height:auto !important;color:#006699 !important;background:none !important;">item>
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<code class="keyword" style="margin:0px !important;padding:0px !important;outline:0px !important;float:none !important;vertical-align:baseline !important;position:static !important;left:auto !important;top:auto !important;right:auto !important;bottom:auto !important;height:auto !important;width:auto !important;line-height:1.1em !important;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace !important;font-weight:bold !important;font-size:1em !important;min-height:auto !important;color:#006699 !important;background:none !important;">title>RSS Tutorialtitle>
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<code class="keyword" style="margin:0px !important;padding:0px !important;outline:0px !important;float:none !important;vertical-align:baseline !important;position:static !important;left:auto !important;top:auto !important;right:auto !important;bottom:auto !important;height:auto !important;width:auto !important;line-height:1.1em !important;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace !important;font-weight:bold !important;font-size:1em !important;min-height:auto !important;color:#006699 !important;background:none !important;">link>网站地址/rsslink>
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