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What is Google AdSense?
Google.com earns most of its revenue by allowing other website owners to advertise on their search result pages. All this is managed through a program they call AdWords. Now you can earn a share of the revenue that Google earns from AdWords by placing these same text ads on your site. In other words, you're helping Google advertise and they pay you a percentage of what they earn.
This program is called AdSense.

Every website owner should be involved in this. It's just too good of an opportunity to pass up. Even if your site is just for information purposes, you can still participate and make decent money with AdSense -- or at least enough to fund your website.So if you are one of those people that don't like the idea of paying for a site, this is an excellent way to earn your money back and then some.Even if you earned as little as $10 in a month, it would more than likely cover some or all of the costs for your web site. Perhaps you are simply looking for ways to add additional revenue to your website, then it's perfect for that situation too. This program is getting so popular, people are creating websites just to display the ads and profit from Google's AdSense alone.I don't usually like to use the term "easy money" because there really is no such thing. You still have to create your own website and learn how to bring in traffic in order to make good money with this program.I certainly don't want to make it sound like you get something for doing absolutely nothing. There's no such thing.However, I've got to say that AdSense is probably the closest you'll ever come to fast money on the Internet -- especially if you already have a website that gets a good amount of traffic. What's even better...the program is completely free. You can also use it on multiple websites and there is no limit to the amount you can earn.
How AdSense Works ?
If you go to Google.com and do a search for almost any keyword phrase, you'll notice some "Sponsored Links" that appear on the right side of the screen that are relevant to the keywords you just searched for.
Website owners pay Google to display these ads and are charged a predetermined amount every time their ad gets clicked by a web surfer. With the AdSense program, you will display these same text ads on your site just like Google and get paid for it as well.
All you do is copy and paste some provided HTML code into your pages and Voila! the ads will show up. Every time an ad is clicked on your site, you will receive a certain percentage of what Google receives from the advertiser.
Once your account reaches $100, you'll receive a check in the mail.