You might ask yourself this question: How Google works?
Too easy, it is a scanner of the web.
The next obvious question comes as How does Google make money if it is for free?
I heard this question like 1 million times. The answer is here:
Imagine that – Google can make so much money from ads THAT YOU SEE ON THE TOP and RIGHT SIDEBAR Of GOOGLE.com and other Google sites which cost from a few pennies, to a few dollars per click.
What do you want from Google in 2009?
