Adsense for Search: A way to earn more irrespective of the topic of your blog

Adsense for Search is also the speciality of Adsense.Google has used it's power of search engine for making lot of money from it (Google Adwords is major source of income for Google).The best thing about Adsense for Search is that you can earn very high revenue per click irrespective of the topic of your blog.
It works in the following manner:
1.Publisher has to put the Google search box on his/her blog.
2.When a visitor searches for something (through that search box), he/she comes across the search results page with some ads on it.
3.When the visitor clicks the ad, you will get paid.

Where do these ads come from?
These ads are part of the Google's famous marketing program, Google Adwords. The advertisers bid on the specific keyword to get their ads on top.So, the popular keywords return very good results in terms of revenue.

It has been found that the visitors have tendency to search for the keyword which is not always related to the topic of your blog.
e.g.If you own a blog which is about the types of flowers, plants etc.You will surely not earn much from the clicks( say $0.07 per click) on ads coming under "Adense for Content".But you always have bright chances of earning 20 times more ( upto $1.4 per click) through adsense for Search.That's the biggest advantage of it.

The Search box works better when positioned on the right top part of your home page.