Click-through rate (CTR) is the number of users who click on a specific link out of the total users who view a page, email, or advertisement.mail click-through rate is expressed as a percentage, and calculated by dividing the number of click throughs by the number of tracked messages delivered. Most email marketers use this metrics along with open rate, bounce rate and other metrics, to understand the effectiveness and success of their email campaign.
Moonbat is a pejorative political epithet used in United States politics, referring to liberals, progressives, or leftists.
Planetshine is the illumination, by reflected sunlight from a planet, of part of the otherwise dark side of one of its moons. The best known example of planetshine is earthshine, which can be seen from Earth when the Moon is new, or nearly so.