Google AdSense Blog announced that AdSense for Search is now powered by Custom Search.
"Custom Search is built on top of the Google index. This means that all pages that are available on Google are also available to your search engine"(Google Webmaster Central Blog).
Webmasters or site owners by installing a powered search box into own site and customize it with advanced options can improve the accuracy of the search results to let users quickly find what they're looking for.
The new features are as follows:
- Site Search
- Improved indexing of your pages
- Vertical search
- Tuning search results and ads with keywords
- Selecting ad location
- Quick and easy updates