The important AdSense features are listed below.

Google ads are based on your website content. The keyword rich content decides your ads.

Google says :

"We go beyond simple keyword matching to understand the context and content of web pages. Based on an algorithm that includes such factors as keyword analysis, word frequency, font size, and the overall link structure of the web, we know what a page is about, and can precisely match Google ads to each page."

Occasionally Google gets it wrong. It places great importance on the file name. So be sure to use important keywords in the file name of each page, such as "contextual-advertising.html" for an article on contextual advertising.

Google adsense allows you to display either textual ads or image ads or both.

Example Adsense Ad Formats

Google adsense allows upto 3 ad units per webpage. These ad units can be of same kind or different type.

• leaderboard (728x90)
• banner (468x60)
• skyscraper (120x600)
• medium rectangle (300x250)

Google's Search is also available to adsense users in the name of adsense for web search. Google adsense allows 2 search units per web page. Adsense for search can be both as web search and site search.

Google adsense is backed by google's unique keyword matching algorithm. Thus the ads coming on your site is based on the keywords in your sites content.

From your adsense control panel you can view the live statistics of the clicks, impressions , CPM ( Earnings per 1000 impressions), CTR ( Click Through Rate ), each day's earnings. These statistics are almost real time now. You will get the data with in seconds.

You can add up to 200 sites to your filter list. The URLs you enter into your filter list can be the actual URL of the website or the URL that is displayed on the ad for that website.

Channels provide you with a way to view detailed reporting about the performance of your pages. By pasting channel-specific ad code into any combination of pages, you can track a variety of metrics across your sites. Track your leaderboard performance versus the performance of your towers, or compare your motorcycle pages to your automobile pages, by assigning each group of pages to a specific channel and comparing results in your custom channel reports. You can even assign a channel to each of your separate domains, to see where your clicks are coming from.

With up to 50 AdSense channels, plus 50 AdSense for search channels available for each publisher, you can use channels to gain the insight you need to optimize your site's performance. It's easy to add, deactivate, or rename your channels, and customized reports are simple to generate.

Alternate ads allow you to utilize your ad space in the event that Google is unable to serve targeted ads to your page. By specifying an image, HTML page, or ad server of your choice, you can make sure that your advertising space is always being used effectively, either by targeted Google ads, or by your own choice of content. You can also select a solid color or collapsing ad unit script as your alternate ad, if you prefer not to display other advertisements or content when targeted Google ads are unavailable. Alternate ads count as page impressions like any other ad. Google does not keep track of clicks on alternate ads and you will not receive revenue for them. Alternate ads, if specified, will be shown when there are no targeted ads available for your page.

Collapsing ad units are an optional advanced feature of alternate ads – the collapsing ad unit code will 'collapse' your ad unit so that it takes up no page space if there are no targeted ads available. This allows you to minimize any blank space that would otherwise occur through the use of alternate colors.You will need to host a small HTML file on your domain. Your alternate ad URL will reference this file, which will be called if there are no ads available for that particular ad unit.

Click here to download the script.