AdSense Program

You need to apply and be accepted by Google before you can display the AdSense ads on your web site. They are very particular about the sites that are eligible and accepted. Google’s name is on the ads and they cannot risk hurting the perceived value of the AdSense and AdWords programs.
Google requires you to comply with their program policies if your website is accepted into the AdSense program. Otherwise, your website may be dropped from the program.
Your site must be content-focused to be accepted. Google wants sites that offer high quality information or rich in relevant content. You should have lots of interesting and informative content for your site visitors.
As previously mentioned, AdSense is a program in which you get paid for your web site visitors clicking on targeted AdWords ads placed on your site. A click through is when a visitor clicks on one of the ads. The ads are placed in a display box that you put on your website in a location that earns you money.
You have a chance to make a significant amount of money if the AdSense box is placed in a strategic location on your site and you have sufficient targeted traffic.
The AdWords advertiser pays as little as $0.05 per click up to $100 per click depending on the unique keywords. The AdWords campaigns are usually budgeted for a specific period of time by the advertisers.