Clickthrough Rate (CTR):
- The number of clicks an ad receives, divided by the total number of times that ad is displayed or served (represented as: total clicks / total impressions = CTR). For example, if an ad has 100 impressions and 3 clicks, the CTR is 3 percent.
 
Knowing the CTR of your ads will help you to drill down & tailor your ads best to your visitors.  This can only help to increase your conversions and boost sales because your visitors will see the ads that are the most relevant to your content.
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Glossary Definition From ABC’s of Online Marketing by Alexandra Wharton, Issue 22, Revenue Magazine
				