Google Adsense

Google, the oracle of Internet search engines, has a great ad delivery service called Adsense which allows you to run ads based on the content Google indexes from your blog. This method for displaying ads is called contextual advertising. The ads come in varying sizes, and you can customize them to match your blog design through the Google Adsense web-based interface.

Google Adsense serves both text and graphic ads to your blog in a relatively unobtrusive manner. Google does have to approve your participation in Adsense, so if it deems your site controversial or offensive, it may deny your application. Google Adsense is free.

Google pays for the ads on either a cost-per-click (CPC) or cost-per-1000-impressions (CPM) basis. Your potential advertisers pay Google either when your readers click on the ads (CPC) or whenever their ads are displayed on your blog (CPM). You receive a certain portion of this payment via check every month, provided your ads have generated revenue. And a minimum amount of $100 must be earned before Google will issue a check. Google does not disclose the exact amount that you receive per click or impression, but you can make money with Google Adsense if you use it in accordance with Google's guidelines.