SEM是Search Engine Marketing的缩写，中文意思是搜索引擎营销。SEM是一种新的网络营销形式。SEM所做的就是全面而有效的利用搜索引擎来进行网络营销和推广。SEM追求最高的性价比，以最小的投入，获最大的来自搜索引擎的访问量，并产生商业价值。
　　SEM可以在搜索引擎中进行品牌的维护，将品牌的负面信息尽可能少的呈现在搜索用户面前，可以预防竞争对手在网络上恶意的诬陷。同时可以在进行正面和商业信息的推广，进而达到品牌推广的目标！

Search Engine Marketing SEM is the abbreviation of the Chinese search engine marketing means. SEM is a new form of online marketing. SEM did was comprehensive and effective use of search engines to conduct online marketing and promotion. SEM to achieve the highest cost, with minimal input by the largest traffic from search engines and generate business value.
SEM search engine in the maintenance of the brand, the brand of negative information as little as possible before the presentation of the search user, you can prevent competitors in the network, malicious framed. During the same time can promote a positive and business information, thereby to achieve branding goals!
　　SEM的服务主要有4种方式：
　　一、 竞价排名，顾名思义就是网站付费后才能被搜索引擎收录并靠前排名，付费越高者排名越靠前；竞价排名服务，是由客户为自己的网页购买关键字排名，按点击计费的一种服务。客户可以通过调整每次点击付费价格，控制自己在特定关键字搜索结果中的排名；并可以通过设定不同的关键词捕捉到不同类型的的目标访问者。
　　而在国内最流行的点击付费搜索引擎有百度，雅虎和Google。值得一提的是即使是做了PPC（Pay Per Click，按照点击收费）付费广告和竞价排名，最好也应该对网站进行搜索引擎优化设计，并将网站登录到各大免费的搜索引擎中。

SEM's services are mainly 4 ways:
1, PPC, paid before the name suggests is the site to be your search engine and front rank, who paid the higher the ranking the more toward the front; PPC services are provided by customers to buy keywords for their website rankings, total per-click a service fee. Customers can pay by adjusting the price per click, control their own specific keyword in the search results ranking; and can set different key words to capture different types of targeted visitors.
In the most popular PPC search engines, Baidu, Yahoo and Google. It is worth mentioning that even do PPC (Pay Per Click, pay per click) ads and PPC, the best should also be search engine optimized website design and website log on to the major free search engines .

　　二、 购买关键词广告，即在搜索结果页面显示广告内容，实现高级定位投放，用户可以根据需要更换关键词，相当于在不同页面轮换投放广告；

Second, buy keyword advertising on search results page displays the advertising content, to achieve high positioning put in, the user can be replaced key words, the equivalent of rotation of ads in different pages;
　　三、 搜索引擎优化（SEO），就是通过对网站结构、关键字选择、网站内容规划进行调整和优化，使得网站在搜索结果中靠前。 搜索引擎优化（SEO）又包括网站内容优化、关键词优化、外部链接优化、内部链接优化、代码优化、图片优化、搜索引擎登录等。
　　PPC 为 Pay Per Click的缩写 PPC是英文Pay Per Click的缩写形式,其中文意思就是点击付费广告。
　　目前，SEM正处于发展阶段，它将成为今后专业网站乃至电子商务发展的必经之路。
　　SEO是属于SEM的一部分，是实现SEM搜索引擎整合营销的一种手段。

Third, search engine optimization (SEO), is through to the site structure, keyword selection, site planning to adjust and optimize the content so that site in search results front. Search Engine Optimization (SEO), it also includes web content optimization, keyword optimization, external link optimization, internal link optimization, Code optimization, image optimization, search engine registry and so on.
PPC stands for the Pay Per Click Pay Per Click PPC is the abbreviation of the English form, its meaning in Chinese is click advertising.
At present, SEM is in the development stage, it will be the future development of professional e-commerce website and even a must.
SEO SEM are a part, is to achieve integrated search engine marketing SEM as a means.