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When you are using keyword tools, either for your pay per click (PPC) campaigns or for search engine optimization (SEO) purposes. There are certain features that you want to look for in the best keyword tools that are available. One of the most important aspects of a good keyword tool is the source of its information. For a long time, most of the keyword tools relied on the Overture database for their data. Overture used to be the Yahoo Search Marketing tool. The numbers in this database were always suspect. However, internet marketers didn’t have a lot of choice as this was the biggest and best one available at the time. The problem with databases is that they are essentially static, for large periods of time. This means that you are relying on old data that may or may not reflect the current state of a particular website or websites. Now that the Overture database is essentially dead, or at least very unreliable, keyword research tools have had to come up with new sources of data. The most common way that they now gather their data is through extrapolation of very small amounts of search data into larger numbers.  For example, the word tracker database, which is used by many Internet marketers relies on something like 0.6 or 0.7% of Internet searches and then extrapolates that number out to the market share that Google enjoys. Needless to say the margin for error is huge for this type of prediction.

There are some new keyword tools just becoming available that do not rely on database. Rather, they  visit actual websites and get their keywords and key phrases from live websites. This provides very up-to-date keyword information. One such tool that relies solely on live website information is 3D Market Vision. 3D Market Vision also includes a proprietary Estimated Searches per Day algorithm that is far more accurate than and other search estimate tool.