AdWords.
Now you can win a share of revenue from Google AdWords to display these same text ads on your site. In other words, you're helping Google advertise and get paid a percentage of what they earn. Google can not determine the exact percentage, but the ideal is that Google kept 25% of revenues and spend 75% of advertising.
This program is called AdSense.

Every website owner should at least consider the program. Even if your site is just for information purposes or a very basic one, 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 doesn't like the idea of paying for a site, this is an excellent way to earn your money back or more it all depends on you.
So you have a website you apply for adsense and Google approved your account. After this you have to put Google ads code into your website then promote your website, optimize it for search engines look for visitors and be patient.
I know what you think ...
"What's the trick here and why Google is donating money advertisers are paying for?"
The answer ...
Because Google is very smart.
If you understand how AdSense, you'll see it's a win-win for everyone involved, and the bottom line benefits Google. Let me explain ...
Because the ads of advertisers being displayed on sites across the internet more (rather than the Google site), which is described. More exposure means more clicks and more traffic to your site for a short period of time.
This is good news for Google because the more traffic the advertisers receive, the faster your advertising funds are exhausted.
Remember, they charge every time your site is visited and, of course, Google hopes that will continue to spend more money to maintain your account for more ad exposure.
What an ingenious way for Google to increase the amount of money they earn from advertisers while loyalty with website owners (like us) who pay to help them advertise.
Of course I expected no less of the search engine the most popular on the web.