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. 搜索引擎優化 （ SEO ）是一個子搜索引擎營銷，以及處理與改善的數目和/或質量的遊客到一個網站，從“自然” （又名“有機”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.在實際上，徐是營銷呼籲機器算法，以增加搜索引擎的相關性和最終的Web流量。 This is analogous to foot traffic in retail advertising.這是類似於步行交通，零售廣告。 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“搜索引擎優化” ，一個行業顧問誰進行優化項目，代表客戶。

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.搜索引擎顯示各種不同的上市公司的搜索引擎結果頁（ serp ） ，其中包括在付費廣告的形式，每次點擊支付的廣告和付費收錄的物品，以及未付的有機搜索結果和關鍵字，具體的物品，如新聞故事，的定義，地圖的位置和圖像。 SEO is concerned with improving the number and position of a site’s listings in the organic search results.徐是關注與改善的數目和位置，一個網站的上市，在有機搜索結果。

SEO strategies vary widely, in accordance with the specific site.徐策略大不相同，按照該特定網站。 Broadly speaking, SEO may be geared towards increasing either, or both, the total number and quality of visitors from Search Engines.大致來說，徐可面向要么增加，或兩者，總的數量和質量的遊客從搜尋引擎。 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.質量訪問者可以衡量如何，往往訪問者使用特定的關鍵字，導致了理想的轉換動作，例如直接購買或要求進一步資料。

Search engine optimization is available as a stand-alone service or as a part of a larger marketing campaign. 搜索引擎優化 ，可作為一個獨立的服務或作為的一個組成部分，較大型的營銷活動。 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.因為徐往往需要作出改變，源代碼的一個網站，往往是最有效的當納入初步的開發和設計一個網站，導致一詞的使用“搜索引擎友好”來形容設計，菜單，內容管理系統和購物車，可以很容易的優化和有效。

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僱於在徐，包括改變一個網站的代碼（稱為頁的“因素” ）和取得聯繫，從其他網站（簡稱為“小康頁的因素” ） 。 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.這些技術包括兩大類：技術，搜索引擎的建議的一部分，良好的設計，以及這些技術的搜索引擎並不贊同，並試圖盡量減少的影響，被稱為spamdexing 。 Some industry commentators classify these methods, and the practitioners who utilize them, as either “white hat SEO”, or “black hat SEO”.一些業內人士評論，這些分類方法，以及執業誰利用他們，因為無論是“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拒絕黑與白的二分法的帽子，作為一個過度簡化。

SEO, as a marketing strategy, can often generate a good return.徐，作為一個營銷策略，通常可以產生一個很好的回報。 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.不過，由於搜索引擎是不支付的交通使他們在發送或從有機搜索，算法的使用可以做的改變，還存在許多問題，可能導致搜索引擎的問題時，抓取或排名網站的頁面，有沒有保證成功的，無論是在短期或長期。 Due to this lack of guarantees and certainty, SEO is often compared to traditional Public Relations (PR), with PPC advertising closer to traditional advertising.由於缺乏擔保和確定性，徐往往是比較傳統的公共關係（ PR ）的，與PPC的廣告更接近傳統廣告。

The above document was provided to me by email by a SEO company which was spamming me.上述文件是提供給我的電子郵件由徐公司是垃圾郵件箱。 I realized the information will be useful to many and worth sharing.我意識到這些信息將是有益的和許多值得分享的。