The first reason why Adsense is essential for content sites is because it has come a long way in understanding the needs of publishers and webmasters. Along with its non-stop development is the emergence of a more developed system that allows full ad customization.

The second reason is the ability to AdSense publishers to track not only how their sites are progressing but also the earnings based on the webmaster-defined channels. The new improved search engine allows webmasters the ability to monitor how their ads are performing using customizable reports that has the capacity to detail page impressions, clicks and click rates. With the introduction of real-time reports in hand.

The final reason is that the advertisers have realized the benefits of making their ads on targeted Web sites. As a result, increasing the chance that a surfer will have an interest in their products and services.

There was a time when people were not yet aware that the money is obtained from advertising. The cash generated only came into existence when the webmasters and publishers realized how they can make Adsense producer. In those days the content was the most important factor to be taken seriously. It still is. With the lure of money.