HI, NOt sure what CTR means in CJ, but in ClickBank it means Click Through Rate. I'm pretty sure it would mean the same thing, because it's jsut another affiliate network. Let me know what you find out! Later,
On CJ it means from the percentage of clicks ratio with impressions. If it says 1000 impressions and 1% CTR, that means 10 people clicked on your ad from that ad being shown 1k times.
Click Thru Ratio. It doesn't really mean much if you are running text ads, but obviously for banners it's more meaningful.