How AdSense Works

• The webmaster inserts the AdSense JavaScript code into a webpage.
• Each time this page is visited, the JavaScript code uses inlined J SON 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 Ad Sense 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^. The 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.

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

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.
On February 22, 2012, Google announced that it was shutting down its Hosted AdSense for Domains program.

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 Java and Objective-C are used

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.^[5] However the publisher is paid only if the advertisements on the page are clicked; AdSense does not pay publishers for regular searches. Web publishers have reported that they also pay a range from $5.67 to $18.42 per click

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."^[12]
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 Content

The content-based adverts can be targeted for interest or context. The targeting can be CPC (click) or CPM (impression) based. There's no significant difference^[11] between CPC and CPM earnings, however CPC ads are more common. There are various ad sizes for available for content ads. The ads can be simple text, image, animated image, flash, video, or rich media ads. At most ad sizes, users can change whether to show both text and multimedia ads or just one of them. As of November 2012, a grey arrow appears beneath AdSense text ads for easier identification.

Product Specific Policies

AdSense for content: Publishers may place up to three AdSense for content ad units on each page. Out of those three ad units, no more than one can be size 300x600. Publishers can place more than one of all ad sizes except the 300x600 on each page. In addition to three AdSense for content ad units, publishers may also place up to three link units and two search boxes on each page. These policies apply to both desktop and high-end mobile optimized sites.
AdSense for search: A maximum of two Google AdSense for search boxes may be placed per page. Also, a single link unit or image ad only may be placed on pages with AdSense for search results. Queries must originate from users inputting data directly into the search box and cannot be modified. This includes pre-populating the search box with terms or hard-coding direct links to search results pages. AdSense for search code may not be integrated into any software application such as a toolbar.

Webmaster Guidelines

Webmaster guidelines

AdSense publishers are required to adhere to the webmaster quality guidelines.

• Do not place excessive, repetitive or irrelevant keywords in the content or code of webpages.
• Avoid hidden text or hidden links.
• Avoid "doorway" pages created just for search engines or other "cookie cutter" approaches such as affiliate programs with little or no original content.
• Do not include deceptive or manipulative content or construction to improve your site's search engine ranking (e.g., your site's PageRank).
• Create a useful, information-rich site and write pages that clearly and accurately describe your content.

Traffic sources

Google ads may not be placed on pages receiving traffic from certain sources. For example, publishers may not participate in paid-to-click programs, send unwanted emails or display ads as the result of the action of any software application. Also, publishers using online advertising must ensure that their pages comply with Google's Landing Page Quality Guidelines.

To ensure a positive experience for Internet users and Google advertisers, sites displaying Google ads may not:

• Use third-party services that generate clicks or impressions such as paid-to-click, paid-to-surf, autosurf and click-exchange programs.
• Be promoted through unsolicited mass emails or unwanted advertisements on third-party websites.
• Display Google ads, search boxes or search results as a result of the actions of software applications such as toolbars.
• Be loaded by any software that can trigger pop-ups, redirect users to unwanted websites, modify browser settings or otherwise interfere with site navigation. It is your responsibility to ensure that no ad network or affiliate uses such methods to direct traffic to pages that contain your AdSense code.
• Receive traffic from online advertising unless the site complies with the spirit of Google's Landing Page Quality Guidelines. For instance, users should easily be able to find what your ad promises.

Ad behavior

Publishers are permitted to make modifications to the AdSense ad code so long as those modifications do not artificially inflate ad performance or harm advertisers.

Ad placement

Publishers are encouraged to experiment with a variety of placements and ad formats. However, AdSense code may not be placed in inappropriate places such as pop-ups, emails or software. Publishers must also adhere to the policies for each product used.

Google ads, search boxes or search results may not be:

• Integrated into a software application (does not apply to AdMob) of any kind, including toolbars.
• Displayed in pop-ups or pop-unders.
• Placed in emails, email programs, including webmail, or on pages where dynamic content (such as live chat, instant messaging, or auto-refreshing comments) is the primary focus. (Does not apply to AdMob.)
• Placed in emails, email programs, or chat programs. (Does not apply to AdMob.)
• Obscured by elements on a page.
• Placed on any non-content-based page. (Does not apply to AdSense for search, mobile AdSense for search, or AdMob.)
• Placed on pages published specifically for the purpose of showing ads.
• Placed on pages whose content or URL could confuse users into thinking it is associated with Google due to the misuse of logos, trademarks or other brand features.
• Placed on, within or alongside other Google products or services in a manner that violates the policies of that product or service.

Site behavior

Sites showing Google ads should be easy for users to navigate. Sites may not change user preferences, redirect users to unwanted websites, initiate downloads, include malware or contain pop-ups or pop-unders that interfere with site navigation.

Google advertising cookies

AdSense publishers must have and abide by a privacy policy that discloses that third parties may be placing and reading cookies on your users' browsers, or using web beacons to collect information as a result of ad serving on your website.

Google uses the DoubleClick cookie on publisher websites displaying AdSense for content ads. Subject to any applicable laws, rules and regulations, you will have the sole and exclusive right to use all data derived from your use of the DoubleClick cookie for any purpose related to your business, provided that Google may use and disclose this data subject to the terms of Google's advertising privacy policies and any applicable laws, rules and regulations.
If your current advertising services contract with Google or DoubleClick already has a specific provision defining data ownership, that provision instead of this policy will govern with regard to the data collected under that contract.
Learn more about preparing your privacy policy.

Children's Online Privacy Protection Act (COPPA)

If you implement any Google advertising service on a site or section of a site that is covered by the Children's Online Privacy Protection Act (COPPA), (a) you must notify Google of those sites or sections of sites covered by COPPA using the tool found, and (b) you must not use interest-based advertising (including remarketing) to target: (i) past or current activity by users known by you to be under the age of 13 years or (ii) past or current activity on sites directed at users under the age of 13 years.

Source:https://support.google.com/

Gambling Content

AdSense restricts the placement of ads on gambling sites and gambling-related content. We have different policies for gambling content based on the country in which a publisher is located. Publishers outside a limited group of countries are not allowed to place ads on any gambling content or on any pages with links to gambling content. This includes any content that allows users to place bets or play games in exchange for an opportunity to earn money or other prizes.

In this selected group of countries, publishers are allowed to monetize pages with online gambling, information about online gambling content and pages that link to gambling content. Gambling content includes: online casino games, sports betting, bingo, lotteries, tips, odds, handicapping, mahjong, educational/supplemental materials and bonus codes.

Austria	Greece	Portugal
Belgium	Ireland	Romania
Canada	Italy	Serbia
Denmark	Israel	Spain
Finland	Norway	Sweden
France	Peru	United Kingdom

Currently, these publishers must meet Google’s stringent requirements for consideration and need to be selected and approved by the AdSense Policy Team before ads can be shown. If you're eligible, AdSense will be sure to contact you. Publishers located outside of these countries aren’t permitted to place ads on content that allows any type of betting or has links to such content.

To keep the Global Display Network family safe, ads will only be shown on gambling content if both the publisher and the page’s visitor are located within a gambling-approved country and if the visitor is of legal age.

Additionally, publishers now have the opportunity to opt in to receiving gambling ads through the category filtering feature. If you don't wish to receive gambling ads on your site, no action is required on your part.

Publishers who have not been not selected or approved for gambling content:

Allowed	Not allowed
Sites with play-for-fun games, contests, sweepstakes, raffles Location-based gambling sites (hotel casinos and destination travel sites) Sites promoting fantasy sports Sites selling books, ebooks, magazines, TV shows that discuss gambling-related activities Discussion forums or blogs about gambling that don’t drive traffic to online gambling sites Sites selling gambling equipment	Online gambling sites, such as online casinos or online wagering sites Sites that drive traffic to online gambling sites, such as through organic links

Publishers who have been selected and approved for gambling content, and are located in one of the following countries: Austria, Belgium, Canada, Denmark, Finland, France, Greece, Ireland, Italy, Israel, Norway, Peru, Portugal, Romania, Serbia, Spain, Sweden, United Kingdom:

Allowed

Online gambling sites, such as online casinos or online wagering sites Sites that drive traffic to online gambling sites, such as through organic links Sites with play-for-fun games, contests, sweepstakes, raffles Location-based gambling sites (hotel casinos and destination travel sites) Sites promoting fantasy sports Sites selling books, ebooks, magazines, TV shows that discuss gambling-related activities Discussion forums or blogs about gambling that don’t drive traffic to online gambling sites Sites selling gambling equipment

Content Guidelines

Sites with Google ads may not include or link to:

• Pornography, adult or mature content
• Violent content
• Hate speech (including content that incites hatred or promotes violence against individuals or groups based on race or ethnic origin, religion, disability, gender, age, veteran status, or sexual orientation/gender identity), harassment, bullying, or similar content that advocates harm against an individual or group.
• Excessive profanity
• Hacking/cracking content
• Illicit drugs and drug paraphernalia content
• Sales of beer or hard alcohol
• Sales of tobacco or tobacco-related products
• Sales of prescription drugs
• Sales of weapons or ammunition (e.g., firearms, firearm components, fighting knives, stun guns)
• Sales of products that are replicas or imitations of designer or other goods
• Sales or distribution of coursework or student essays
• Content regarding programs which compensate users for clicking ads or offers, performing searches, surfing websites or reading emails
• Any other content that is illegal, promotes illegal activity or infringes on the legal rights of others

Publishers are also not permitted to place AdSense code on pages with content primarily in an unsupported language.

Copyrighted material

AdSense publishers may not display Google ads on webpages with content protected by copyright law unless they have the necessary legal rights to display that content. This includes sites that display copyrighted material, sites hosting copyrighted files, or sites that provide links driving traffic to sites that contain copyrighted material. Please see our DMCA policy for more information.

Source: https://support.google.com

Adsense Programe Polices

All publishers are required to adhere to the following policies, so please read them carefully. If you fail to comply with these policies without permission from Google, we reserve the right to disable ad serving to your site and/or disable your AdSense account at any time. If your account is disabled, you will not be eligible for further participation in the AdSense program.
Because we may change our policies at any time, please check here often for updates. In accordance with our online Terms and Conditions, it's your responsibility to keep up to date with, and adhere to, the policies posted here. Exceptions to these policies are permitted only with authorization from Google.

Invalid clicks and impressions

Publishers may not click their own ads or use any means to inflate impressions and/or clicks artificially, including manual methods.

Source: https://support.google.com/