Short for click-through rate, the ratio of the number of times a user clicks on an online advertisement per number of viewers who view the Web site that has the advertisement on it. For example, if one out of 100 people who visit a specific Web site click on an advertisement and are taken to the advertiser's site, then the CTR of that advertisement is 1/100, or 1%.
Courtesy of http://www.webopedia.com/TERM/C/CTR.html
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If you are wondering whether or not your site is performing, you may want to take a look at some of the Typical CTRs in different forms of advertising . There are many reasons your site may or may not be generating the type of revenue for you that it could. Consider the following as Typical CTRs in different forms of advertising .
Read article here
http://intentclick.com/typical-ctrs-forms-advertising
