The Search-based Keyword Tool generates keyword and
landing page ideas highly relevant and specific to your website. In
doing so, the tool helps you identify additional advertising
opportunities that aren’t currently being used in your AdWords ad
campaigns. The tool goes one step further by tailoring the keywords and
other data (such as the amount of competition for the keyword, the
suggested bid, and more) based on your language or country/territory
settings.
Based on your URLs, the Search-based Keyword Tool displays a list of
relevant user queries that have occurred on Google.com (and on other
Google search properties, such as google.co.uk) with some frequency
over the past year; these suggestions can be found under the Keywords tab, in the New keywords related to (site) section. In the Keywords related to your search section, you can see a broad list of keyword ideas that are also relevant, but aren’t necessarily based on your site.
The keywords are also organized by category. Click any category
to expand and view its subcategories. If applicable, you’ll also see
the keywords organized by brand names.
Important note: We can’t guarantee that these
keyword suggestions will improve your campaign performance.
Additionally, we reserve the right to disapprove any keywords you add
to your campaigns. You’re responsible for the keywords you select and
for ensuring that your use of the keywords doesn’t violate any
applicable laws or our Terms of Service.
This information is taken from the google tools faq. Best of luck to you using the new offerings from google