View keywords popularity (for free). Pay to appear at the top of Google searches.
Google AdWords is Google's advertising service that will make your ad appear that the top of Google's search results.
Within Google AdWords, the "Keyword Planner" tool can offer a good SEO help if you're looking for good keywords to use. Keyword Planner will help you know how popular keywords are and can, by doing so, also inspire you to find the right keywords to target, might it be for an AdWords campaign or simply to use on your site. Going after less popular keywords that still match your interest could allow you to be a big fish in a small pond and get more opportunities that way.
Google AdWords is free to access (including the Keyword Planner tool).
Cost of advertising varies upon your campaign specifics (such as the keywords selected).
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