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An external keyword tool is essential if you want to speed up your efforts in a selling campaign. You know that to get across your message, for the best and easiest results, your product has to stand out from the competition.
A word or words or even a short phrase will be the key for the customer to find your product with minimal effort. You can spend time picking your brains and with no assurance of guaranteed results for the right and best set of words to get the needed attention.
Your solution is an external keyword tool. Google has one that is of great help, but time consuming. You may have to spend literally hours in the choice and certainty and it still comes to a best guess. I do not want to mention other free tools, as Google is still the best free one.
So you know that the free tools won't give you a quick and easy answer. That's why they are free in the first place. As almost always you have to pay for something of real value. But you should think of the purchase as an investment in profits.
Your search can start where everybody is looking nowadays: in the search engines and Google is still king. Also go into related forums and see what people have to say. Read reviews and comments.
You want to look for a tool that will give you quick reliable answers. You want highly relevant keywords, but you want to know your chances against your competition. This last point is so very important. In fact what is the good if you are not given the full facts about the strength of your competitors.
Some of these tools will also incorporate other very interesting and helpful features. You actually need the facts of 4 critical elements in order to make an informed decision. As they say, knowledge is power, power to succeed. So you should seriously consider a good external keyword tool.

Gianfranco Focarelli recommends you visit his website for marketing strategies, resources and ideas for your business.