define Tail terms

Definition:

Search terms that are very specific, long phrases that include one or more modifiers, such as “cheapest power-boating near Cincinnati.” These longer, more specific terms are called “tail terms” based on a bell-curve distribution of keyword usage that displays the low numbers of little-used terms at the “tail” end of the bell curve graph. Although long, specific and lesser-used tail terms have low CTRs, they are less competitive (and therefore cheaper) and often catch buyers at the end of the purchase decision process. This means that, even with low click-through numbers, tail terms can have good conversion rates.