网站优化，简称SEO，是Search Engine Optimization的英文缩写，全称是搜索引擎优化。搜索引擎优化是一种利用搜索引擎的搜索规则来提高目的网站在有关搜索引擎内的排名的方式。复杂但更严谨的一点的定义如下：是指在了解搜索引擎自然排名的基础上，对网站进行内部及外部的调整优化，改进网站的搜索引擎中的关键词自然排名，获得更多流量，从而达成网站销售及品牌建设的目标。

　　经研究发现，搜索引擎的用户往往只会留意搜索结果最前面的几个条目，所以不少网站都希望通过各种形式来影响搜索引擎的排序。当中尤以各种依靠广告维生的网站为甚。所谓“针对搜索引擎作最佳化处理”，是指为了要让网站更容易被搜索引擎接受。通过网站优化技术将网站在百度中排到较好的位置就能自然性的为我们的网站带来大量的廉价流量。搜索引擎优化虽然不是免费的，但是性价高，相对成本较低的一种营销方式，全国24小时有效，但需要经历漫长的优化周期。一般搜索引擎对新站的考核周期，谷歌为6个月，百度为2个月【也称沙盒效应(由谷歌定义)】。

　　SEO是搜索引擎的朋友，有搜索引擎的地方就有SEO。当今主流的搜索引擎：百度、360、搜狗、谷歌、QQ、神马搜索-移动端，在几个搜索引擎中，除了谷歌，都属于国内，其中最大的搜索引擎是百度。

　　SEO是网络营销的一部分。虽然你也可以通过很多其他的形式对网站进行推广，但它是网络营销的一个最重要利器之一。

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