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How to earn money on the Web



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Google AdSense is an ad serving program run by Google. Website owners can enroll in this program to enable text, image and, more recently, video advertisements on their sites. These ads are administered by Google and generate revenue on either a per-click or per-thousand-impressions basis. Google is also currently beta-testing a cost-per-action based service.
                               

Google uses its search technology to serve ads based on website content, the user's geographical location, and other factors. Those wanting to advertise with Google's targeted ad system may sign up through AdWords. AdSense has become a popular method of placing advertising on a website because the ads are less intrusive than most banners, and the content of the ads is often relevant to the website.

Currently, AdSense uses JavaScript code to incorporate the advertisements into a participating site. If it is included on a site which has not yet been crawled by the Mediabot, it will temporarily display advertisements for charitable causes known as public service announcements (PSAs). (The Mediabot is a separate crawler from the Googlebot that maintains Google's search index.)

Many sites use AdSense to monetize their content. AdSense has been particularly important for delivering advertising revenue to small sites that do not have the resources for developing advertising sales programs and salespeople. To fill a site with ads that are relevant to the topics discussed, webmasters implement a brief script on the sites' pages. Sites that are content rich have been very successful with this advertising program, as noted in a number of publisher case studies on the AdSense site.

Some webmasters work hard to maximize their own AdSense income. They do this in three ways:

  1. They use a wide range of traffic generating techniques including but not limited to online advertising.
  2. They build valuable content on their sites which attracts AdSense ads which pay out the most when they get clicked.
  3. They use copy on their websites that encourage clicks on ads. Note that Google prohibits people from using phrases like "Click on my AdSense ads" to increase click rates. Phrases accepted are "Sponsored Links" and "Advertisements".

The source of all AdSense income is the AdWords program which in turn has a complex pricing model based on a Vickrey second price auction, in that it commands an advertiser to submit a sealed bid (not observable by competitors). Additionally, for any given click received, advertisers only pay one bid increment above the second-highest bid.

public service announcements (PSAs). (The Mediabot is a separate crawler from the Googlebot that maintains Google's search index.)

History
The underlying technology behind AdSense was derived originally from WordNet, Simpli (a company started by the founder of Wordnet, George A. Miller) and a number of professors and graduate students from Brown University, including James A. Anderson, Jeff Stibel and Steve Reiss
. A variation of this technology utilizing Wordnet was developed by Oingo, a small search engine company based in Santa Monica founded in 1998.Oingo changed its name to Applied Semantics in 2001,which was then bought by Google for $102 million in April 2003.

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 the reader/browser, Google writes the ad content into the image that it returns. The ad 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 site in the same way as regular AdSense ads.

AdSense for feeds has remained in its beta state ever since its original announcement. Only selected AdSense users have been allowed to sign up for it, and no more users are being admitted to the program

AdSense for search

A companion to the regular AdSense program, AdSense for search lets website owners place Google search boxes on their pages. When a user searches the web or the site with the search box, Google shares any ad revenue it makes from those searches with the site owner. However the publisher is paid only if the ads on the page are clicked: Adsense does not pay publishers for mere searches.

How AdSense works
In order to put ads on a web page, the webmaster inserts JavaScript code into the page.

  • Each time a page with an AdSense tag is visited, the JavaScript creates an iframe and sets its "src" attribute to the page's URL.
  • 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, ads are served for those keywords based on the AdWords bidding system. More details are described in the AdSense patent.
  • For site-targeted ads, the advertiser chooses the page(s) to display ads on and pays based on CPM (cost-per-thousand-impressions, or the price advertisers choose to pay for every thousand ads displayed).
  • For referrals, Google adds money to the advertiser's account when visitors either download the referred software or subscribe to the referred service.
  • Search ads are added to the list of results after a user performs a search.
  • Since the JavaScript is sent to the web browser when the page is requested, it is possible for other site owners to copy the JavaScript into their own web pages. To protect against this type of fraud, AdSense customers can specify the pages on which ads should be shown. AdSense then ignores clicks from pages other than those specified. 

  
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