Adsense is a pay-per-click program freely provided by the major search engine Google. The program allows you to add a stream of income through your site by displaying sponsored ads, and earn revenue for each unique click. There are three ways AdSense can earn revenue for you: Adsense for Content, Adsense for Search, Referrals. This is a very easy way to add an extra stream of income to your site.

AdSense for Content

AdSense for Content is broken down into Ad Units and Link units. Ad units display text ads, image ads, or both. Link units display a list of topics that are relevant to the content on your page; when a user clicks on a link they are taken to a page displaying relevant ads. The ads appear in their own section and you can choose from varying sized ad areas to incorporate into your website’s layout. You can also customize the color palette of the section so it works with your website’s theme. The whole process is customizable; you can even exclude competitors from appearing within your ad sections.

AdSense for Search

AdSense for Search allows you to add a Google Search section to your web page. The user can either search the Google network or just your site. When a user clicks on a sponsored link within the search results, you earn revenue.

Referrals

Google also has a referral program for various products and services they provide. As an example, you can promote the firefox web browser with Google toolbar.

Someone might be compelled to pepper a web page with multiple Adsense sections, but Google places restrictions how many you place on page.

• Adsense for Content, three ad units and one link unit per page.
• Adsense for Search, two search boxes per page.
• Adsense Referrals, two referral units per page.

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