from
http://en.wikipedia.org/wiki/AdWordsAdWords is
Google's flagship advertising product, and main source of revenue. AdWords offers
pay-per-click (PPC) advertising, and site-targeted advertising for both text and
banner ads. The AdWords program includes local, national, and international distribution. Google's text advertisements are short, consisting of one title line and two content text lines. Image ads can be one of several different Interactive Advertising Bureau (IAB) standard sizes.
Pay-Per-Click advertisements (PPC)
Advertisers specify the words that should trigger their ads and the maximum amount they are willing to pay per click. When a user searches Google's search engine on www.google.com, ads for relevant words are shown as "sponsored link" on the right side of the screen, and sometimes above the main search results.
The ordering of the paid listings depends on other advertisers' bids (pay for placement P4P) and the "quality score" of all ads shown for a given search. The quality score is calculated by historical click-through rates and the relevance of an advertiser's ad text, keyword, and landing page to the search, as determined by Google. The quality score is also used by Google to set the minimum bids for an advertiser's keywords.[1]
The auction mechanism that determines the order of the ads has been called a "generalized second price" auction. It is a variation of the Vickrey auction.
Site targeted advertisements
In 2003 Google introduced site-targeted advertising. Using the AdWords control panel, advertisers can enter keywords of interest, and Google offers to place ads on what they claim are relevant sites within their content network. Advertisers then bid on a cost per mille (CPM) basis for placement. However, Google does not provide advertisers with a list of sites where their ads have been placed, and there is evidence that many of the "content network" sites are merely ad pages set up on parked domains. Advertisers can provide a list of sites where they do not wish their ads to appear, but cannot obtain a list of sites where their ads could or do appear.
AdWords distribution
All AdWords ads are eligible to be shown on www.google.com. Advertisers also have the option of enabling their ads to show on Google's partner networks. The "search network" includes AOL search, Ask.com, and Netscape. Like www.google.com, these search engines show AdWords ads in response to user searches.
The "content network" shows AdWords ads on sites that are not search engines. These content network sites are those that use AdSense, the other side of the Google advertising model. AdSense is used by publishers who wish to bring traffic to their websites. Click through rates on the content network are typically much lower than those on the search network and are therefore ignored when calculating an advertiser's quality score.
Google automatically determines the subject of pages and displays relevant ads based on the advertisers' keyword lists. AdSense publishers may select channels to help direct Google's ad placements on their pages, to better track performance of their ad units. There are many different types of ads you can run across Google's network, including text ads, image ads (banner ads), local business ads, mobile text ads, and in-page video ads.
Google AdWords' main competitors are Yahoo! Search Marketing and Microsoft adCenter.
Click-to-Call
Google Click-to-Call is a service provided by Google which allows users to call advertisers from Google search results pages. Users enter their phone number, Google calls them back and connects to the advertiser. Calling charges are paid by Google.
History
The AdWords product was launched in 2000.[2] At first advertisers would pay a monthly amount, and Google would set up and manage their campaign. To accommodate small businesses and those who wanted to manage their own campaigns, Google soon introduced the AdWords self-service portal. As of 2005, Google provides a campaign management service called Jumpstart [3] to assist advertisers in setting up their campaigns.
In 2005, Google launched a program to certify individuals and companies who have completed AdWords training and passed an exam. Due to the complexity of AdWords and the amount of money at stake, some advertisers hire a consultant to manage their campaigns.
Legal context
AdWords has generated lawsuits in the area of trademark law and click fraud. In 2006, Google settled a click fraud lawsuit for US$90 million. [4]
Overture Services, Inc. sued Google for patent infringement in April 2002 in relation to the AdWords service. Following Yahoo!'s acquisition of Overture, the suit was settled in 2004 with Google agreeing to issue 2.7 million shares of common stock to Yahoo! in exchange for a perpetual license under the patent. [5]
Technology
The AdWords system was initially implemented on top of the MySQL database engine. After the system had been launched, management decided to use a commercial database (Oracle) instead. As is typical of applications simultaneously written and tuned for one database, and ported to another, the system became much slower, so eventually it was returned to MySQL ([1])
