The Google Keywords Suggestion tool is a free long tail keyword research tool that lets you find profitable keyword suggestions directly from Google search. For any given keyword phrase entered, you could receive up to 370 long tail keyword ideas.
Since this long tail keyword tool is using Google Auto Suggest to find long tail keywords, you can utilize these keywords in any search engine optimization (SEO) campaign, especially considering these keywords are from real users that actually typed in these phrases into Google.
A long tail keyword is a keyword (or, rather, a search that has been made on the internet) which is really specific to something that the searcher is looking for.
Suggest button to get the list of long tail keywords.