Search engine optimization (SEO) is a subset of search engine marketing, and deals with improving the number and/or quality of visitors to a web site from “natural” (aka “organic” or “algorithmic” search engine) listings. 搜索引擎优化 （ SEO ）是一个子搜索引擎营销，以及处理与改善的数目和/或质量的游客到一个网站，从“自然” （又名“有机”或“算法”搜索引擎）上市。 In effect, SEO is marketing by appealing to machine algorithms to increase search engine relevance and ultimately web traffic.在实际上，徐是营销呼吁机器算法，以增加搜索引擎的相关性和最终的Web流量。 This is analogous to foot traffic in retail advertising.这是类似于步行交通，零售广告。 The term SEO can also refer to “search engine optimizers”, an industry of consultants who carry out optimization projects on behalf of clients.任期徐也可以指“搜索引擎优化” ，一个行业顾问谁进行优化项目，代表客户。

Search engines display different kinds of listings on a search engine results page (SERP), including paid advertising in the form of pay per click advertisements and paid inclusion listings, as well as unpaid organic search results and keywords specific listings, such as news stories, definitions, map locations, and images.搜索引擎显示各种不同的上市公司的搜索引擎结果页（ serp ） ，其中包括在付费广告的形式，每次点击支付的广告和付费收录的物品，以及未付的有机搜索结果和关键字，具体的物品，如新闻故事，的定义，地图的位置和图像。 SEO is concerned with improving the number and position of a site’s listings in the organic search results.徐是关注与改善的数目和位置，一个网站的上市，在有机搜索结果。

SEO strategies vary widely, in accordance with the specific site.徐策略大不相同，按照该特定网站。 Broadly speaking, SEO may be geared towards increasing either, or both, the total number and quality of visitors from Search Engines.大致来说，徐可面向要么增加，或两者，总的数量和质量的游客从搜寻引擎。 The quality of a visitor can be measured by how often a visitor using a specific keyword leads to a desired conversion action, such as making a purchase or requesting further information.质量访问者可以衡量如何，往往访问者使用特定的关键字，导致了理想的转换动作，例如直接购买或要求进一步资料。

Search engine optimization is available as a stand-alone service or as a part of a larger marketing campaign. 搜索引擎优化 ，可作为一个独立的服务或作为的一个组成部分，较大型的营销活动。 Because SEO often requires making changes to the source code of a site, it is often most effective when incorporated into the initial development and design of a site, leading to the use of the term “Search Engine Friendly” to describe designs, menus, Content management systems and shopping carts that can be optimized easily and effectively.因为徐往往需要作出改变，源代码的一个网站，往往是最有效的当纳入初步的开发和设计一个网站，导致一词的使用“搜索引擎友好”来形容设计，菜单，内容管理系统和购物车，可以很容易的优化和有效。

A range of strategies and techniques are employed in SEO, including changes to a site’s code (referred to as “on page factors”) and getting links from other sites (referred to as “off page factors”).一系列的策略和技巧是受雇于在徐，包括改变一个网站的代码（称为页的“因素” ）和取得联系，从其他网站（简称为“小康页的因素” ） 。 These techniques include two broad categories: techniques that search engines recommend as part of good design, and those techniques that search engines do not approve of and attempt to minimize the effect of, referred to as spamdexing.这些技术包括两大类：技术，搜索引擎的建议的一部分，良好的设计，以及这些技术的搜索引擎并不赞同，并试图尽量减少的影响，被称为spamdexing 。 Some industry commentators classify these methods, and the practitioners who utilize them, as either “white hat SEO”, or “black hat SEO”.一些业内人士评论，这些分类方法，以及执业谁利用他们，因为无论是“白色的帽子，徐” ，或“黑帽徐” 。 Other SEOs reject the black and white hat dichotomy as an over-simplification.其他seos拒绝黑与白的二分法的帽子，作为一个过度简化。

SEO, as a marketing strategy, can often generate a good return.徐，作为一个营销策略，通常可以产生一个很好的回报。 However, as the search engines are not paid for the traffic they send from organic search, the algorithms used can and do change, and there are many problems that can cause Search Engine problems when crawling or ranking a site’s pages, there are no guarantees of success, either in the short or long term.不过，由于搜索引擎是不支付的交通使他们在发送或从有机搜索，算法的使用可以做的改变，还存在许多问题，可能导致搜索引擎的问题时，抓取或排名网站的页面，有没有保证成功的，无论是在短期或长期。 Due to this lack of guarantees and certainty, SEO is often compared to traditional Public Relations (PR), with PPC advertising closer to traditional advertising.由于缺乏担保和确定性，徐往往是比较传统的公共关系（ PR ）的，与PPC的广告更接近传统广告。

The above document was provided to me by email by a SEO company which was spamming me.上述文件是提供给我的电子邮件由徐公司是垃圾邮件箱。 I realized the information will be useful to many and worth sharing.我意识到这些信息将是有益的和许多值得分享的。