we know that google's robot searches websites for keywords , then reports back and tells the company what kind of ads to send to the site . it your site is about pension plans for example , then your keywords would be things like "retirement ' , '401k'' and "pension ". getting the right keywords on your site won't just make your ad relevant ; it will also help you to make sure that the ads you get are the ones that pay again , you don't want to build a site just to cash in on high paying keyword but if you know that "401k " pays more than "retirement " for example , then it makes sense to use the higher paying keywords more than the lower paying ones . here are some tools to search for high paying keywords You can use Adwords keyword tool to select keywords and you'll get some information. But there are many, many great tools out there that will help you select the right keywords for your AdSense campaign focus. Look for only those tools that provide information about the number of searches performed, the number of competing websites and a "guestimate" of profitability. WordTracker is probably the best known and most popular tool for finding keywords that are profitable and that have little competition. However, it does entail a subscription fee so that you want to subscribe for the period that you will actually use the tool and no longer. You can subscribe for a day, a week or a month, or indefinitely. Only those people who use the tool frequently should consider an indefinite subscription due to the high cost. NicheBot is a free tool that is really handy for this. Unlike WordTracker which costs quite a bit for a subscription, this tool has just about everything you need or want and it is absolutely free to use. It is web-based and perhaps not quite as fast as WordTracker, but it works just great. And it is being upgraded all the time with new features. KeyWordDiscovery offers a free trial period, after which there is a subscription fee. However, it is a reasonably popular tool for keyword researching. Overture Keyword Research Tool is another free tool that you can use. It gives you the information you need but the output is based on Overture search engines and you would do much better to get Google search engine results. To find the right tools for you, try several of the free tools you'll find with a simple Internet search. You may find one that meets your needs very well. If not, then it is time to begin using some of the subscription services. However the absolute King Of Keyword Research is Keyword Elite, with the push of a button you have all the keywords you can dream of for your adwords campaign or adsense website. Make sure to pay them a visit and check out the videos and tutorials with true life examples keyword density you'll need the right keywords to get the right ads .but you'll also need the right amount of keywords . there's no golden rule for the putting right number of keywords on a page to get the ads you want you'll just have to experiment . it also seems to be the case that keyword density is counted across pages ,especially for high paying keywords . if you have a site that's generally about cars and you write a page for car rental , a higher-paying keyword , you might find that you need to produce several pages about car rental before you get the ads In general though , if you find that your ads are missing the point of your page and that your titles are all correct , then the next step would be to try mentioning your keywords more often and make sure that they're all finely focused . for example , ralking about "fire extinguishers " is likely to get you better results thn talking generally about "safety equipment ''.