搜索引擎优化SEO
搜索引擎优化SEO(中文6300字,英文3400字)
搜索引擎优化（Search Engine Optimization，简称SEO）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。由于不少研究发现，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击的排序。当中尤以各种依靠广告维生的网站为甚。
所谓“针对搜索引擎作优化的处理”，是指为了要让网站更容易被搜索引擎接受。搜索引擎会将网站彼此间的内容做一些相关性的数据比对，然后再由浏览器将这些内容以最快速且接近最完整的方式，体现给搜索者。
搜索引擎优化对于任何一家网站来说，要想在网站推广中取得成功，搜索引擎优化都是至为关键的一项任务。同时，随着搜索引擎不断变换它们的排名算法规则，每次算法上的改变都会让一些排名很好的网站在一夜之间名落孙山，而失去排名的直接后果就是失去了网站固有的可观访问量。所以每次搜索引擎算法的改变都会在网站之中引起不小的骚动和焦虑。可以说，搜索引擎优化是一个愈来愈复杂的任务。
英文原文
SEO
Search engine optimization (SEO) is the process of improving the volume or quality of traffic to a web site from search engines via "natural" or un-paid ("organic" or "algorithmic") search results as opposed to search engine marketing (SEM) which deals with paid inclusion. Typically, the earlier (or higher) a site appears in the search results list, the more visitors it will receive from the search engine. SEO may target different kinds of search, including image search, local search, video search and industry-specific vertical search engines. This gives a web site web presence. [资料来源：https://www.doc163.com]
As an Internet marketing strategy, SEO considers how search engines work and what people search for. Optimizing a website primarily involves editing its content and HTML and associated coding to both increase its relevance to specific keywords and to remove barriers to the indexing activities of search engines.
The acronym "SEO" can refer to "search engine optimizers," a term adopted by an industry of consultants who carry out optimization projects on behalf of clients, and by employees who perform SEO services in-house. Search engine optimizers may offer SEO as a stand-alone service or as a part of a broader marketing campaign. Because effective SEO may require changes to the HTML source code of a site, SEO tactics may be incorporated into web site development and design. The term "search engine friendly" may be used to describe web site designs, menus, content management systems, images, videos, shopping carts, and other elements that have been optimized for the purpose of search engine exposure.