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google adwords is the best tools for keyword research.

Keywords are real words you are targeting in hope that your visitors will search, so if you make proper research then you can understand what your client think and how they search on internet,this is main importance of keyword research.

you should also give a try to the software called IBP, it provides great functionality related to Search Engine Optimization.

I use Google Keyword Tool I am not sure if there is a better tool out there. But I'm using this mainly because it's free and it's because it's from Google.

i use google ad word

some misspelled keywords also ranks well.