Google Adsense

What is Google Adsense?
Google AdSense is an ad serving application run by Google Inc. Website owners can enroll in this program to enable text, image, and video advertisements on their websites. These advertisements are administered, sorted, and maintained by Google, and they can generate revenue on either a per-click or per-impression basis. Google beta tested a cost-per-action service, but discontinued it in October 2008 in favor of a DoubleClick offering (also owned by Google). In Q1 2011, Google earned US$2.34 billion ($9.36 billion annualized), or 28% of total revenue, through AdSense

Types
AdSense for Feeds

In May 2005, Google announced a limited-participation beta version of AdSense for Feeds, a version of AdSense that runs on RSS and Atom feeds that have more than 100 active subscribers. According to the Official Google Blog, "advertisers have their ads placed in the most appropriate feed articles; publishers are paid for their original content; readers see relevant advertising—and in the long run, more quality feeds to choose from."

AdSense for Feeds works by inserting images into a feed. When the image is displayed by a RSS reader or Web browser, Google writes the advertising content into the image that it returns. The advertisement content is chosen based on the content of the feed surrounding the image. When the user clicks the image, he or she is redirected to the advertiser's website in the same way as regular AdSense advertisements.

AdSense for Feeds remained in its beta state until August 15, 2008, when it became available to all AdSense users. AdSense for search

A companion to the regular AdSense program, AdSense for search, allows website owners to place Google Custom Search boxes on their websites. When a user searches the Internet or the website with the search box, Google shares 51% of the advertising revenue it makes from those searches with the website owner. However the publisher is paid only if the advertisements on the page are clicked; AdSense does not pay publishers for regular searches.

AdSense for search

A companion to the regular AdSense program, AdSense for search, allows website owners to place Google Custom Search boxes on their websites. When a user searches the Internet or the website with the search box, Google shares 51% of the advertising revenue it makes from those searches with the website owner. However the publisher is paid only if the advertisements on the page are clicked; AdSense does not pay publishers for regular searches.

AdSense for mobile content

AdSense for mobile content allows publishers to generate earnings from their mobile websites using targeted Google advertisements. Just like AdSense for content, Google matches advertisements to the content of a website — in this case, a mobile website. Instead of traditional JavaScript code, technologies such as PHP, ASP and others are used.

AdSense for domains

AdSense for domains allows advertisements to be placed on domain names that have not been developed. This offers domain name owners a way to monetize domain names that are otherwise dormant or not in use. AdSense for domains is currently being offered to all AdSense publishers, but it wasn't always available to all.

On December 12, 2008, TechCrunch reported that AdSense for Domains is available for all US publishers.

AdSense for video AdSense for video allows publishers with video content to generate revenue using ad placements from Google's extensive Advertising network including popular YouTube videos.




How AdSense works

The webmaster inserts the AdSense JavaScript code into a webpage.
Each time this page is visited, the JavaScript code uses inlined JSON to display content fetched from Google's servers.
For contextual advertisements, Google's servers use a cache of the page to determine a set of high-value keywords. If keywords have been cached already, advertisements are served for those keywords based on the AdWords bidding system. (More details are described in the AdSense patent.)
For site-targeted advertisements, the advertiser chooses the page(s) on which to display advertisements, and pays based on cost per mille (CPM), or the price advertisers choose to pay for every thousand advertisements displayed.
For referrals, Google adds money to the advertiser's account when visitors either download the referred software or subscribe to the referred service. referral program was retired in August 2008.
Search advertisements are added to the list of results after the visitor performs a search.
Because the JavaScript is sent to the Web browser when the page is requested, it is possible for other website owners to copy the JavaScript code into their own webpages. To protect against this type of fraud, AdSense customers can specify the pages on which advertisements should be shown. AdSense then ignores clicks from pages other than those specified.

How much will I earn with AdSense?

There's no precise answer, because your earnings will depend on a number of factors.

• The type of ads appearing on your pages: By displaying ads with AdSense for content, you can display ads that are paid when users click them or when users view them. All ads compete in an ad auction, and our system automatically selects those which will generate the most revenue for you while ensuring a good user experience.
• The pricing of ads appearing on your pages: Not all ads are priced the same, so factors such as changing advertiser budgets, your specific content, and the ads your users choose to click will cause your earnings to vary even from day to day.
• How many AdSense products you use: You can earn from AdSense in many different ways -- by displaying ads on your webpages, by providing search to your users, by displaying ads in feeds, and more. Using more AdSense products will increase your potential earnings.

The best way to find out how much you'll earn is to sign up and start showing ads on your webpages. There's no cost, no obligation, and getting started is quick and easy.

Once you're a part of Google AdSense, you can see your earnings at any time by signing in and viewing your reports. You'll be able to see the total number of ad clicks, impressions, clickthrough rate, and your total earnings. This information will give you an idea of how well the program is performing for you and how much you can expect to earn over time in the program.

How do I earn money with AdSense?

The main way of earning revenue with AdSense is by displaying Google ads on your site.

With AdSense for content, these ads you display on your site can be either cost-per-click (CPC) or cost-per-thousand-impression (CPM) ads. For CPC ads, you'll generate earnings when your users click on the ads. For CPM ads, you'll generate earnings every time the ad appears to a user viewing your site.

You can also generate earnings while enabling your users to search your site and the web. Learn about earning with AdSense for search.

Cost-per-mile (CPM) advertising networks are networks that pay publishers a set amount for every 1,000 page impressions. The ads will show up right on the website itself or will manifest as pop-up or pop-under ads. Choosing the best CPM advertising networks depends on much more than how much the network pays per impression. Other important considerations, especially if the publisher wants to keep his website audience, are the quality of the ads, the visitor threshold of the CPM network, whether CPM advertising networks can run simultaneously, and whether the networks accept the website’s country of origin.

Ad quality is always a question and consideration when choosing CPM advertising networks or any other advertising schema. Ads that appear on the page are generally considered more natural and less annoying than pop-up or pop-under ads. What the ad itself is saying also may help keep visitors or push away the website’s intended audience. For example, if the CPM network shows adult ads but the website is supposed to be kid-friendly, this can alienate the audience.