The Google’s most popular worldwide accepted free program by which anyone can earn money through displaying targeted Google ads on their websites is called AdSense. AdSense provides different sizes of ad units so that webmaster can choose and implement them on their web page according to available space. AdSense also provides Google search for your website users, when someone uses Google search on your website, search results pages display Google ads resulting you earn money. When Google started AdSense program, there were a lot of people who doubted Google’s idea would be marketable and actually will generate any profits. Google proved that they were wrong, and today AdSense is a well known program which is profitable for everyone. AdSense is not only profitable for Google, it is profitable for those people who advertise in Google AdWords and also profitable for publishers who use it on their websites to make money. So one must ask himself why AdSense is such a good deal for everyone. And the question in itself is very reasonable because you hardly ever come across something that is profitable for everybody in the chain. AdSense is giving benefits to everybody whoever uses it, because it exploits a gap in the Internet's advertising model. AdSense links together to buyers and sellers. Google know that there are people who want to buy stuff and people who want to sell them what they are interested in. AdSense helps to both by displaying targeted ads. AdSense works very well for the web surfers, because its ads don’t provide a huge graphic banner which tries to lure you into buying something. AdSense ads have few words, you can click ad, if you are interested in giving links. It works because surfers don't have that feeling of someone trying to lure them into spending money. It works for the advertisers because their ads display to targeted audience and they get listed in Google’s search engine without working too much for SEO. AdSense ads are contextual and related to the keywords you deal with on your web pages. This is understood that the Visitors who are on your web pages, they are interested in that topic. Therefore visitors click on ads when they find same relevant ads for what they were looking and buy the things. Visitors not only click ads but they come back again and again to visit that website, thus you get unique traffic. AdSense ads can reach any website in any country and maintain to display only key words or contents related ads which are available on the web pages. It's very simple for Google to do this because Google is a search engine company. It looks for the key words on your web page, searches a database of websites to find the ones related to whatever is on your web page and display a targeted ad. This is the speciality of the AdSense that’s why advertisers and publishers are fond of AdSense. Off course there are also some problems for you to use AdSense on your website, because if knowingly or unknowingly you clicked on your AdSense ads Google can terminate your account. Therefore you must be very careful and you should also teach your friends and family members not to do so. Google treats it as a click fraud and never tolerate, they have many ways to check click fraud. Google has a very strict policy regarding click fraud you must read Google's terms to use of AdSense before putting them on your website. Overall it’s great to have AdSense ads on your website. You can start online earnings without much effort and you can enjoy online living with Google’s AdSense. Since it is free to use, therefore you have nothing to lose. You must appreciate Google for their simple but very useful AdSense program. Although AdSense is a big subject it cannot be summarized in one article yet I tried to give you as much as I can, you have to learn more if you are really interested to work with AdSense.