The chances are that you've seen "Ads by Google" on a variety of websites and perhaps wondered what they were all about. The fact is that you can probably get "Ads by Google" on your own site and if you do, you can look forward to getting paid by Google.

The system is called Google AdSense and it does two things really neatly.

First of all it allows virtually any website owner to make some money without having to do too much - all you do is paste some code that Google gives you into your web pages. This code creates the ads that you see and when someone clicks on one of these ads they go to the advertiser's site. The advertiser is then charged for the click by Google and Google shares the money with you. You don't have to worry about billing a load of different companies or anything else: this is all done for you as part of the AdSense service.

That much is fairly straightforward and good news.

But the really clever thing about AdSense is that the ads you see on your site are relevant to your content - automatically. So if you have a web page about mobile phones you'll see ads about mobile phones on it. If you have a web page about holidays in Tasmania, you'll see ads for holidays in Tasmania on it. Google's technology scans your web page and decides what it is about and then searches its database of well over 175,000 advertisers to find the ads that are most suitable for your page.

By making the ads relevant to your site, Google does you two favors: the ads can enhance the overall experience a visitor to your site gets which means they are likely to return, and because the ads are relevant to your visitor, they are likely to get clicked on.

And when they get clicked on, you make money.

To make most money with Google AdSense you need to develop web pages that are about high value topics. In other words, build content on your site that is likely to attract ads that pay highly when clicked because not all ads are worth the same.

In fact some ads pay many dollars a click whereas others only pay a few cents.

The art of maximizing your AdSense income is to understand how to attract high paying ads onto your pages and then drive a lot of traffic to those pages. Once you've done that you can look forward to getting paid by Google on a regular basis which makes Google AdSense one of the most attractive affiliate programs on the internet today.

William Charlwood is the author of The Definitive Guide to Google AdSense.