Clickthrough Rate. Slightly inexact because some clicks “get lost” between the click and your server. Also be sure to ask if the CTR is unique, meaning that each individual user is only counted once no matter how many times they click on a link.
Building Your Business with an Opt-in List
Before revealing the secrets of the trades, here are myths and fallacies that need to be cleared before one indulges into building an opt-in list.