The click-through rate and click-to-open rate are two different terms, but are often confused even by the experts. While, click-through rate is the percentage of clicks on the link that generates impressions, click-to-open rate shows the percentage of unique clicks and unique impressions. Click-through rate will give you an overview of the clicks, but click-to-open rate will show all the necessary details. Therefore, being an Email Marketer, you must clearly understand the difference between Click-through rates and Click-to-open rates as you may require them at different times and for unique purposes.