6. The number of times that users click on links in an email or on a Web site
SearchCRM.com
In banner advertising on a Web site, the clickthrough rate (CTR) is the percentage of times that viewers of a Web page click on a given banner ad, causing a request for the advertiser's Web site to be transmitted to the viewer. For example, if two out of every 100 visitors to a Web page clicked on a given ad...
Read the rest of the entry