So we all know about longtail keyword vs. short tail. However, it seems that the definition is a bit inconsistant. Some people say longtail keywords are keywords that get very low amounts of traffic, others that they are key phrases with 2 or more words. And others add to this that they have high conversion rate but describe specific features, product, service, model # etc.
In an ideal model I suppose all of these things would be true. As keyword length increases, traffic tends to decrease, keyword is more specific pointing at features, model#, specific product etc and therefore the conversion rate is a bit higher as well.
However, the data isn't a perfect curve. I will see keywords that get 18,000 searches but have 4 words. And then I will see single word key phrases that get <10 -20 searches a month. What am I to consider these? Its like they fit half the criteria. Any comments on this would be helpful and appreciated. I suppose the real question I am after is - it seems like the real definition of a long tail keyword cant be any of the above traits of a long tail keyword. How do you really define a long tail keyword in all circumstances (without it being this subjective idealized definition based on a perfect model) and where would the keyword circumstances (lots of words but high traffic, and low traffic but 1 word) fall in the graph? Center?