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什么是 CPM, CPC, CPA and CTR

什么是CPM？

CPM means Cost Per Thousand. (M is the Roman numeral for thousand – and so Cost Per Thousand).
CPM的意思是 每千次展示成本。（M 是罗马数字 1000,所以 CPM 就是每千次展示成本）

This is the amount you will pay the ad-network or website publisher to show your ad a thousand times on their website or across their ad-network.
也就是你要在 广告网络 或者 网站 那里展示1000次你的广告时需要向他们支付的成本。

Whether your ad is shown only once to each visitor (Unique Impressions) or any number of times – is something that you will have to work out with the nad-network or the website.
或者你的广告是每个访问者只展示一次（惟一印象）或者是任意多次，这些都需要你与广告网络商或者站长来一起确定。

CPM rates were once (pre yr 2000 bubble-burst era) as much as $75, but have now dropped to as little as $1 CPM.
CPM价格曾经(在2000网络泡沫破灭之前)高达75美元,但是现在已经降到了低至1美元。

什么是CPC?

CPC means Cost Per Click. This is how much you would pay the ad-network or website every time a visitor clicks on your banner. CPC rates can be as high as $3 per click or as little as 5 cents per click. It depends on your product and your market – amongst other factors, the more competition there is – the higher you will probably end up paying as you compete with competitors.
CPC（Cost per Click）是指每次点击成本。是指当访问者每次点击你的广告时你需要向广告网络商或者站长支付的成本。CPC的价格可以高达每点击3美元，也可你至5美分。这取决于你的产品和你的市场以及其他一些因素，竞争越激烈，你需要支付的成本就越高，因为你需要与竞争者竞争。

什么是CPA?

CPA means Cost Per Action. The Action could be any of the following types of actions – A visitor clicking on your banner coming to your site and filling up a simple enquiry form (CPR – Cost Per Registration) , or if the visitor makes a purchase (CPS – Cost Per sale). It could be a flat fee or a percentage commission of the sale made. Affiliate-Networks like commissionjunction , linkshare and clickbank have very good software systems in place to track all this and provide statistics to online merchants and publishers on their network of websites.

CPA(Cost per Action)意思是每次动作的成本。动作可能是以下任何类型：
一个访问者点击了你的广告条;
访问了你的网站并且填写了一个表单(CPR-Cost Per Registration 每注册成本)
购买了你的产品(CPS-Cost per Sale 每销售成本).成本可以是固定的费用或者是以销售额的固定比例作为佣金。联属网络营销，例如commissionjunction , linkshare and clickbank 都有一些非常好的软件系统用来跟踪所有这些行为并且为在线商人或者他们网站的网络发布者提供统计信息。

什么是CTR？

CTR is Click Through Rate. This is the percentage rate at which people click on your ad banner. If your banner ad is seen by 100 people but clicked by one person – then it’s CTR is 1% or .01
CTR(Click Through Rate)点击率。指的是访问者点击你的广告条的百分比。如果有100人看到你的广告并且其中有1人点击了你的广告，那么CRT就是1%或者.01

资料来源：

http://ezinearticles.com/?What-is-CPM,-CPC,-CPA-and-CTR-?&id=1099007