In the past, Google Search-based Keyword Tool was a keyword research tool intended primarily for users of Google AdWords, which is useful also for the strategies of keywords in SEO, in addition to Google Insights for Search or Google Trends.
Search-based Keyword Tool and seo optimization free tips
Unlike other keywords suggestion tools, it is not based on the keywords but on the sites. Indeed, this tool provides suggestions for keywords associated with a site in particular, which are not necessarily identical to those provided for another site, even if it is the same theme.
Google provides 2 lists of suggestions:
-expressions associated with the site that you specified
-more general expressions
For each keyword suggestion, Google says:
-the monthly average volume of searches on Google sites
-an indicator of competition between AdWords advertisers
-a suggestion from auction for a Announces AdWords targeting this keyword
-the frequency with which your ad was displayed for this keyword.