Google AdSense allows webmasters to dynamically serve ads for relevant content on web pages. If the visitor clicks on one of the AdSense ads posted on the website, the website owner receives credit for the referral. The Google AdSense program essentially allows approved websites to dynamically serve Google pay-per-click AdWord results.

AdSense related website maintenance is very easy and requires very little effort. Webmasters just need to embed a Google generated Java script into the web page or website template.
The Google spider analyzes the AdServing website and publishes ads related to the content of the website. Google uses a combination of keyword matching and context analysis to determine which ads to show. The java script calls the google ad and will make sure that the ads are served every time a visitor goes to the web page.

Google initially implemented a filtering system that allowed webmasters to prevent ads from a specific domain from running on any website in their account. Ad blocking meant that webmasters could prevent their competitors’ ads from being dynamically served on their websites.

Google provides a wide variety of ad formats to match the most suitable option for a website. Webmasters can select from a handful of pre-formatted towers, inline rectangles, banners, and buttons. Webmasters can modify the banner boxes to match the color scheme of the website. In:
http://www.ring-tone-software.com (scroll down)
http://www.ringtones-central.com (scroll down)
Prayed
http://www.police-central.com (download left side)
http://www.police-supplies.com (scroll down)

Ads can be geographically targeted based on the location of the visitor. Ads containing content in English, French, German, Italian, Dutch, Portuguese, Japanese, or Spanish are available.

Channels
Google recently introduced channels, improving AdSense reporting.

When a channel is selected, Google modifies the Java script to include additional tracking. Additional tracking information allows webmasters to track a variety of metrics on their sites. Channels can be used to measure performance across domains, differences in revenue across ad sizes, or placement. By assigning each group of pages to a specific channel and comparing the results in custom channel reports, webmasters can work to increase their AdSense earnings.

optimizing
Google determines the content of the ads that are displayed, webmasters who are serious about earning from Google AdSense can use the following guidelines to optimize their website and ensure relevant and targeted ads are served. If Google’s spider has not crawled the site and determined the nature of the content, public service announcements may be served. Public Service Ads will not increase your AdSense earnings if they are clicked. As a result, Google allows webmasters to designate alternative ads. Fallback ads allow webmasters to use ad space in the event that Google is unable to serve targeted ads to the web page. By specifying an alternate image, HTML page, or ad server, the ad space can always be used effectively.

one.) The web page content on the pages where the ads are served must be static, not dynamic.

two.) Make sure robot.txt does not prevent the web page from being crawled. The Robots.txt file must be removed or the following text must be included to allow the Google content bot to crawl the site: User Agent: Media Partners – Google

3.) If the website contains frames, select the “framed page” checkbox when generating the ad layout code for that website.

4.) The page body and page title should contain contextual words that indicate a common theme on the web page.

Earned Income
Although Google does not disclose the exact percentage or revenue share webmasters will earn, webmasters will receive a portion of the amount paid for clicks on Google ads on websites.

AdSense Conclusion:
In general, Google AdWords can provide great additional income for webmasters with content sites. Implementing and maintaining the Google AdSense program on a content site requires very little effort and can often generate a steady stream of additional income for webmasters.